Showing posts with label ISRO. Show all posts
Showing posts with label ISRO. Show all posts

Wednesday, November 23, 2011

ISRO RECRUITMENT


Indian Space Research Organisation [ISRO].
Liquid Propulsion Systems Centre (LPSC)
  • Technical Assistant (Mechanical)-11 Posts
  • Technical Assistant (Electronics)-05 Posts
  • Technical Assistant (Automobiles)-02 Posts
  • Technical Assistant (Civil)-01 Post
  • Technical Assistant (Air Conditioning)-01 Post
  • Technical Assistant (Electrical)-01 Post
  • Technical Assistant (Computer Science)-01 Post
  • Technician ‘B’ (Electronics Mechanic) – 06 Post
  • Technician ‘B’ (Fitter) – 04 Posts
  • Technician ‘B’ (Welder) – 01 Post
  • Technician ‘B’ (Photographer) – 01 Post
  • Technician ‘B’ (Carpenter) – 01 Post
  • Technician ‘B’ (Plumber) – 06 Posts
Last Date: 9th Dec 2011
For details visit the link below:
http://recruit.lpsc.gov.in/common/advt.jsp

Tuesday, October 18, 2011

ISRO RECRUITMENT

Government of India
Indian Space Research Organisation
Liquid Propulsion Systems Centre
Valiamala PO., Thiruvananthapuram-695 547
Advertisement No. LPSC/03/2011 Dated 10.10.2011

Applications are invited for the following posts for LPSC Units located at Valiamala, Near Thiruvananthapuram and Mahendragiri, Near Nagercoil
    1. Scientist/ Engineer-SC : 06 Posts
    • Pay Scale : Rs. 15600-39100/- + Grade Pay Rs. 5400/-
    • Qualification : BE/B.Tech should be in Ist class with an aggregate minimum of 65%. ME/M.Tech should be in First class with an aggregate minimum of 60%.
    2. Medical Officer-SC : 01 Post
    • Pay Scale : Rs. 15600 - 39100/- + Grade Pay Rs. 5400/-
    • Qualification :MBBS + 2 Years experience
Last Date for Apply : 03.11.2011

    Applications completed in all respects should reach the SR. ADMINISTRATIVE OFFICER, RECRUITMENT SECTION, LIQUID PROPULSION SYSTEMS CENTRE, VALIAMALA PO, THIRUVANANTHAPURAM- 695 547

For More Details, Please Visit http://www.lpsc.gov.in/html/recruitmenthome.htm

Wednesday, September 7, 2011

ISRO QUESTION PAPERS



Download ISRO Scientists/ Engineers Exam Papers for Computer Science:
Click here to Download ISRO Exam 2007 Computer Science Papers
.
Click here to Download ISRO Exam 2008 Computer Science Papers
.
Click here to Download ISRO Exam 2009 Computer Science Papers
.
Alternative link for downloading ISRO Exam Computer Science Papers:
Click here to Download ISRO Exam Computer Science Papers


Download ISRO Scientists/ Engineers Exam Papers for Electronics:

Click here to Download ISRO Exam 2006 Electronics Papers
.
Click here to Download ISRO Exam 2007 Electronics Papers
.
Click here to Download ISRO Exam 2008 Electronics Papers
.
Click here to Download ISRO Exam 2009 Electronics Papers

Click here to Download ISRO Exam 2010 Electronics Papers
.
Alternative link forDownloading ISRO Exam Electronics Papers:
Click here to Download ISRO Exam Electronics Papers


Download ISRO Scientists/ Engineers Exam Papers for Mechanical:

Click here to Download ISRO Exam 2006 Mechanical Papers
.
Click here to Download ISRO Exam 2007 Mechanical Papers
.
Click here to Download ISRO Exam 2008 Mechanical Papers
.
Click here to Download ISRO Exam 2009 Mechanical Papers

Click here to Download ISRO Exam 2010 Mechanical Papers
.
Alternative link forDownloading ISRO Exam Mechanical Papers:
Click here to Download ISRO Exam Mechanical Papers


Download ISRO Exam Papers for Administrative Officer:

Click here to Download ISRO Exam 2007 Administrative Officer Papers
.
Click here to Download ISRO Exam 2008 Administrative Officer Papers
.
Alternative link for downloading ISRO Exam Administrative Officer Papers:
Click here to Download ISRO Exam Administrative Officer Papers

Download ISRO Exam Papers for Accounts Officer:
Click here to Download ISRO Exam 2007 Accounts Officer Papers
.
Click here to Download ISRO Exam 2008 Accounts Officer Papers
.
Alternative link for downloading ISRO Exam Accounts Officer Papers:
Click here to Download ISRO Exam Accounts Officer Papers


Download ISRO Exam Papers for Purchase and Stores Officer:

Click here to Download ISRO Exam 2007 Purchase and Stores Officer Papers
.
Click here to Download ISRO Exam 2008 Purchase and Stores Officer Papers
.
Alternative link for downloading ISRO Exam Purchase and Stores Officer Papers:
Click here to Download ISRO Exam Purchase and Stores Officer Papers
Download ISRO Exam Papers for Accounts Officer:
Click here to Download ISRO Exam 2007 Accounts Officer Papers.
Click here to Download ISRO Exam 2008 Accounts Officer Papers.
Alternative link for downloading ISRO Exam Accounts Officer Papers:
Click here to Download ISRO Exam Accounts Officer Papers

Download ISRO Exam Papers for Purchase and Stores Officer:
Click here to Download ISRO Exam 2007 Purchase and Stores Officer Papers.
Click here to Download ISRO Exam 2008 Purchase and Stores Officer Papers.
Alternative link for downloading ISRO Exam Purchase and Stores Officer Papers:
Click here to Download ISRO Exam Purchase and Stores Officer Papers

Monday, August 15, 2011

VSSC Graduate & Technician Apprentice Recruitmemt


Government of India
Department of Space
Vikram Sarabhai Space Centre
Thiruvananthapuram-695022
Advertisement No. VSSC-265
Requires Graduate & Technician Apprentices

Applications are invited for the following posts of Graduate and Technician Apprentices under the Apprentices Act 1961
    1. Graduate Apprentice : 109 Posts
    • Qualification :B.Tech / BE Degree with Ist class (min. 65%) from a recognised university.
    • Disciplines :
        Aeronautical Engg. - 06 Chemical Engg. - 05 Civil Engg. - 04 Computer Sci. / Engg. - 08 Electrical Engg. -04 Electonics Engg. - 30 Mechanical Engg. - 29 Metallurgy Engg. - 04 Production Engg. - 05 Library Science - 14
    • Stipend : Rs. 5000/-
    2. Technician Apprentice : 166 Posts
    • Qualification : Ist class Diploma in Engineering / Technology from a State Council / Board of Technical Education.
    • Disciplines :
        Aeronautical Engg. - 08 Chemical Engg. - 25 Civil Engg. - 08 Computer Sci. / Engg. - 15 Electrical Engg. -10 Electonics Engg. - 40 Instument Technology - 06 Mechanical Engg. - 46 Catering Technology - 08
    • Stipend : Rs. 3000/-
Last Date for Online Apply : 02.09.2011
Online Registration Starts : 17.08.2011

    Interested candidates may apply online through the website www.vssc.gov.in . Applications will be received by online only. Acknoldgement of the web application affixing recent passport sizre photograph and attestd copies of all certificates may be sent to The Administative Officer , Recruitment & Review Division , , VSSC , ISRO Post , Thiruvananthapuram - 695022

For Further Detail and Online Apply, Please visit http://www.vssc.gov.in/internet/getPage.php?page=Recruitment%20Home&pageId=290

Saturday, April 30, 2011

ISRO ENGINEERS ( ELECTRONICS & COMMUNICATIONS) 2010 QUESTION PAPER

FOR ISRO ENGINEERS ( ELECTRONICS & COMMUNICATIONS) 2010 QUESTION PAPER CLICK HERE

ISRO APTITUDE PAPER 2009

1) Special software to craete a job queue is called
a) driver
b) spooler
c) interpreter
d) linkage editer
2)When a process is rolled back as a result of deadlock the difficulty arises is
a) Starvation
b) System throughput
c) low device utilization
d) cycle stealing
3)On recieving an interrupt from an I/O device the CPU
a) Halts for a predefined time.
b) Branches off the interrupt service routine after completion off the current instruction.
c) Branches off to the interrupt service routine immediately.
d) hands over the control of address bus and data bus to the interrupting service.
4) Which of the following is true of the auto increment addressing mode?
1. It is useful in creating sef relocating code.
2)If it is induced in an instruction set architecture , than an additional ALU is required for effective
address calculation.
3) The amount of increment depends on the size of the data item accessed.
a) 1 only.
b)2 only
c) 3 only
d) 2 and 3 only
5) Theprimary purpose of an operating system is
a) To make the most efficient use of the computer hardware.
b) to allow people to use the computer.
c) To make the system programmers employed.
d) to make computers easy to use.
6)consider the cpu intensive processes which require 10,20,30 time units and arrive at time 0,2,6
respectively.how many context switches are needed if the operating system impements a shortest
remaining time first sceduling algorithm?Do not count the context switches at the time 0 and end.
a) 1
b) 2
c) 3
d) 4
7) consider a system having n resources of the same type.These resources are shared by 3 processes
A,B,C .These have peak demands of 3,4,6 respectively.For what value of n deadlock won't occour.
a) 15
b) 9
c) 10
d) 13
8) In which addressing mode the effective address of the operand is computed by adding a constant
value to the content of the register?
a) absolute mode.
b) indirect mode
c) immediate mode
d) index mode
9)the process of organizing the memory into two banks to allow 16 bit and 8 bit data operation is called
a) bank switching
b) indexed mapping
c) two way memory interleaving
d) memory segmentation
10)a one dimensional array A has indices 1-75.Each element is a string and takes up three memory
words. The array is stored in location 1120 decimal. The starting address of A[49] is
a) 1267
b) 1164
c) 1264
d) 1169
11) The microsystems stored in the control memory of a processor have a width of 26 bits. Each
microinstruction is divided into three fields : a microoperation field of 13 bits, a next address field(X),
and a MUX select field(Y). There are 8 status bits in the inputs of the MUX.How many bits are there in
the X and Y fields and what is the size of the control memory in number of words?
a) 10,3,1024
b) 8,5,256
c) 5,8,2048
d) 10,3,512
12)The use of multiple register windows with overlap causes a reduction in the number of memory
accesses for
1.function locals and parameters
2. register saves and restores.
3. instruction fetches.
a) 1 only
b) 2 only
c) 3 only
d) 1,2,and 3
13)Which of the following about relative addressing mode is false?
a) it enables reduced instruction size.
b) it allows indexing of array element with same instruction.
c) it enabkles easy relocation of data.
d) it enables faster address calculation than absulute addressing.
14)Substitution of values for names (whose values are constants) is done in '
a) local optimization
b) loop optimization
c) constant folding
d) strength reduction
15)A root a of eq f(x)=0 can be computed to any degree of accuracy if a good initial approximation x0
is chosen for which
a) f(x0)>0
b) f(x0)f''(x0)>0
c) f(x0)f''(x0)<0
d) f''(x0)>0
16) consider the polynomial p(x)=a0+a1x+a2x*x+a3x*x*x. The mininum number of multipliations
needed to evaluate p on an input x is
a) 3
b) 4
c) 6
d) 9
17)Activities which ensure that the software that has been built , is tracable tocustomer is covered as
part of
a) verification
b) validation
c) maintainnace
d) modeling
18) A testing method which is normally used as the acceptance test for a software system is
a) regression testing
b) integration testing
c) unit testing
d) system testing
19)A locked database file cab be
a) accessed by only one user
b) modified by the users with the correct password.
c) used to hide the sencitive information.
d) updated by more than one user

Thursday, April 21, 2011

ISRO ENGINEERS TECHNICAL QUESTIONS

1.The minimum number of edges in a connected cyclic graph on n vertices is
a) n-1

b) n

c) n+1

d) none of these

2.A full binary tree with n non leaf nodes contains
a) n nodes

b) log n nodes

c)2n-1 nodes

d)2n nodes

3.The time complexity of shell sort a) O(n)

b) O(log n)

c) O(n 1.2 )

d)O(n2)

4.The time taken to insert an element after an element pointed by some pointer
a) O(1)

b) O(log n)

c) O(n)

d) O(nlogn)

5. what is the name given to the first generation computer?
a) Binary language

b)Machine language

c)Assembly language

6.The root directory of a disk should be placed
a) at a fixed address in main memory
b) at a fixed location on disk
c) anywhere on disk.

7.A top down parser generates
a) right most derivation
b) left most derivation
c) right most derivation in reverse
d) left most derivation in reverse

8.what is the name of the OS that reads and reacts in terms of actual time?

a)batch system
b)time sharing
c)real time

9.FDDI is a
a)ring network
b)star network
c)mesh network

10.Computer memory consists of
a)ROM
b)PROM
c)RAM
d)all the above

ISRO ENGINEERS 2011 EXM QUESTIONS

1. The root directory of disk should be placed at_____

—>at a fixed location on the system disk.

2. DNS is basically used to ____

—–>i wrote –to have a hierarchical structure.

3. One more questions on DNS

4. About TCP and UDP

5. TCP’s which layer is there for the OSI’s first three layers.

6. Multiprocessing models have—

a)symmetric b)asymmetric models c)none of the above d) both

7. BCDhave binary nos in

a)bis b) bytes c)nibble

8. Top-down parser….

a) Leftmost derivation

b) Rightmost derivation

c) Leftmost derivation in reverse

D) Rightmost derivation in reverse

9. Loop which avoids check at every iteration

a) Loop controlling b) loop jamming

10. One tree was given and some ex-precisions were there and we have to

find the correct postfix expression

11. Abt logic gates

12. Worst case of Shell sort

13. Sine wave can be split into

a) Set of sine waves

b) Set of sine waves with phase zero

14. Full binary tree with n vertices has how many leaf nodes

something like this…

15. Complete graph with n vertices and something

16. In a cyclic graph with n vertices how many minimum edges

a)n b)n/2…

ISRO ENGINEERS 2006 EXM QUESTIONS

1. If sampling frequency doubles then
a) Quantization noise decreases
b) Quantization density decreases
c) Quantization noise increases
d) Quantization density increases

2. Two signals of 2GHz and 4GHz are frequency modulated on same carrier 10
GHz. Find the ratio of frequency deviation if band widths of both are equal.

a ) 1:2 b)2:1 c) 1:1 d) 1:4

3. Gray code of 111 is

4. 3X512+7X64+5X8+3 then value in binary form contains _______ number of 1?s.
a) 7 b) 6 c) 9 d) none

5. The 2?s compliment of decimal number 19 in 8-bit system is

6) The high gain codes are
a) Turbo codes b) BCH codes c) R-S codes

7) BCH codes are of the type________
a) Convolutional type b) c)
8) Time constant of LC circuit is
a) L/R b) L/R2 c) RL

9) If R is doubled and C is halved then frequency of series RLC circuit is

10) The solution for the equation (D2+4) y=sin2x

Tuesday, April 12, 2011

ISRO Scientist Engineer Computer Science 2009 Paper

1. A full binary tree with n leaves contains
a n nodes
b log2 n nodes
c 2n-1
d 2nnodes
2. The expression 1 * 2 ^ 3 * 4 ^ 5 * 6 will be evaluated as
a 3230
b 16230
c 49152
d 173458
3. The feature in object-oriented programming that allows the same operation to be carried out differently, depending on the object, is
a Inheritance
b Polymorphism
c Overfunctioning
d overriding
4. The microinstructions stored in the control memory of a processor have a width of 26 bits. Each microinstruction is divided into three fields: a microoperation field of 13 bits, a next address field (X), and a MUXselect field (Y). There are 8 status bits in the inputs of the MUX. How many bits are there in the X and Y fields, and what is the size of the control memory in number of words?
a 10,3,1024
b 8,5,256
c 5,8,2048
d 10,3,512
5. A CPU has 24-bit instructions. A program starts at address 300 (in decimal). Which one of the following is a legal program counter (all values in decimal)?
a 400
b 500
c 600
d 700
6. Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 sectors per track. 512 bytes of data are stores in a bit serial manner in a sector. The capacity of the disk pack and the number of bits required to specify a particular sector in the disk are respectively
a 256 Mbyte, 19 bits
b 256 Mbyte, 28 bits
c 512 Mbyte, 20 bits
d 64 Gbyte, 28 bits
7. Consider a pipelined processor with the following four stages
IF: Instruction Fetch
ID: Instruction Decode and Operand Fetch
EX: Execute WB: Write Back
The IF, ID and WB stages take one clock cycle each to complete the operation. The ADD and SUB instructions need 1 clock cycle and the MUL instruction need 3 clock cycles in the EX stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?
ADD R2, R1, RO R2<-R1+RO
MUL R4, R3, R2 R4<-R3*R2
SUB R6, R5, R4 R6<-R5-R4
a 7
b 8
c 10
d 14
8. The use of multiple register windows with overlap causes a reduction in the number of memory accesses for .
1.Function locals and parameters
2.Register saves and restores
3.1nstruction fetches
a 1 only
b 2 only
c 3 only
d 1,2 and 3

9. A processor that has c,arry, overflow and sign flag bits as part of its program status word (PSW}performs addition of the following two 2′s complement numbers 01001101 and 11101001. After the execution of this addition operation, the status of the carry, overflow and sign flags, respectively will be
a 1,1,0
b 1,0,0
c 0,1,0
d 1,0,1
10. The two numbers given below are multiplied using the Booth’s algorithm.
Multiplicand: 0101 1010 1110 1110
Multiplier : 0111 01111011 1101
How many additions/Subtractions are required for the multiplication of the above two numbers?
a 6
b 8
c 10
d 12

11. The addition of 4-bit, two’s complement, binary numbers 1101 and 0100 results in
a 0001 and an overflow
b 1001 and no overflow
c 0001 and no overflow
d 1001 and an overflow
12. Which of the flowing statements about relative addressing mode is FALSE?
a It enables reduced instruction size
b It allows indexing of array element with same instruction
c It enables easy relocation of data
d It enables faster address calculation than absolute addressing

13. Substitution of values for names (whose values are constants) is done in
a Local optimization
b Loop optimization
c Constant folding
d Strength reduction

14. A root α of equation f(x)=0 can be computed to any degree of accuracy if a ‘good’ initial approximation X0 is chosen for which

a f (x0) > 0
b f (x0) f”( x0) > 0
c f (x)0 f” (x0) < 0
d f" (x0) > 0
15. Which of the following statement is correct?

a ∆ (Uk Vk) = Uk ∆ Vk + Vk ∆ Uk
b ∆ (Uk Vk) = Uk+ 1 ∆ Vk + Vk+1 ∆ Uk
C ∆ (Uk Vk) = Vk+1 ∆ Uk + Uk ∆ Vk
d ∆ (Uk Vk) = Uk+ 1 ∆ Vk + Vk ∆ Uk
16. The shift operator E is defined as
E [f(xi)] = f (xi+h) and E-1[f(xi)) = f (xi-h)
Then ∆ (forward difference) in terms of E is
a E - 1
b E
C 1-E-1
d 1-E
17. The formula

a Simpson rule
b Trapezoidal rule
c Romberg’s rule
d Gregory’s formula

18. The cubic polynomial y(x) which takes the following values: y(O)=1, y(1 )=0, y(2)=1 and y(3)=10 is,
a x3 + 2x2 + 1
b x3 + 3x2 – 1
C x3 + 1
d x3 – 2x2 + 1
19. x = a cos(t), y:;: b sin(t) is the parametric form of
a Ellipse
b Hyperbola
c Circle
d Parabola

20. The value of x at which y is minimum for y = x2 -3x + 1 is
a -3/2
b 3/2
c 0
d -5/4

21. The formula
a Newton’s backward formula
b Gauss forward formula
c Gauss backward formula
d Stirling’s formula

22. If G is a graph with e edges and n vertices the sum of the degrees of all vertices in G is
a e
b e/2
c e2
d 2 e

23. Let G be an arbitrary graph with n nodes and k components. If a vertex is removed from G, the number of components in the resultant graph must necessarily lie between.
a k and n
b k-1 and k+ 1
c k-1 and n-1
d k+ 1 and n-k

24. A graph in which all nodes are of equai degree, is known as
a Multigraph
b Non regular graph
c Regular graph
d Complete graph

25. If in a graph G there is one and only one path between every pair of vertices then G is a
a Path
b Walk
c Tree
d Circuit

26. A simple graph (a graph without parallel edge or loops) with n vertices and k components can have at most
a n edges
b (n-k) edges
c (n-k) (n-k+ 1) edges
d (n-k) (n-k+1)/2 edges.
27. Consider the polynomial p(x) = ao + alX + a2x2 + a3x3, where aj 1:- 0, V i. The minimum number of multiplications needed to evaluate p on an input x is
a 3
b 4
c 6
d 9

28. Consider the following code written in a pass-by-reference language like FORTRAN.

S1: The compiler will generate code to allocate a temporary nameless cell, initialize it to 13, and pass the address of the cell to swap
S2: On execution the code will generate a runtime error on line L1
S3: On execution the code will generate a runtime error on line l2
S4: The program will print 13 and 8
S5: The program will print 13 and -2
Exactly the following set of statement(s) is correct:
a S1 and S2
b S1 and S4
c S3
d S1 and S5

29. A square matrix A is called orthogonal if A’ A=
a 1
b A
c -A
d -I

Monday, November 8, 2010

ISRO CS/IT SCIENTIST / ENGINEERS EXAM PAPER



1. Which of the following features usually applies to data in a data warehouse?
(a) Data are often deleted
(b) Most applications consists of transactions
(c) Data are rarely deleted
(d) Relatively few records are processed by applications
(e) None of these
2. Which of the following is a transaction?
(a) A group of SQL statements consisting of one read and one write operation
(b) A group of SQL statements consisting only of ready operations.
(c) A group of SQL statements defining a user-oriented task
(d) A group of SQL statements consisting only of write operations.
(e) None of these
3. There are several security devices used to stop individuals from exploiting your
system. Which of the following is used in conjunction with a firewall?
(a) Proxy server
(b) Intrusion- detection system
(c) Terminal server
(d) Web server
(e) None of these
4. The effect of the ROLLBACK command in a transaction is the following……
(a) Undo all changes to the data- base resulting from the execution of the transaction
(b) Undo the effects of the last UPDATE command
(c) Restore the content of the database to its state at the end of the previous day
(d) Make sure that all changes to the database are in effect
(e) None of these
5. A client / server network ……….
(a) has clients that provide functions such as application control and shared computation.
(b) uses client computers to provide copies of software to the server to allow server
processing.
(c) provides a company with the capability to downsize from lager computer systems and
move away from legacy systems.
(d) has server computers that perform all processing, clients are’ dumb’ input/ output
devices only.
(e) None of these.
6. An applet is ……. Document application program.
(a) a static
(b) a dynamic
(c) an active
(d) a passive
(e) None of these
7. The local antenna for satellite connections is called a ……..
(a) modem
(b) terminal
(c) VSAT
(d) DTA
(e) None of these
8. What are the four basis connecting hardware devices?
(a) Repeater, bridge, router and gateway
(b) Repeater, bridge, router and dell
(c) Repeater, connector, router and gateway
(d) Amplifier, bridge, router and gateway
(e) None of these
9. Which type of processing speed measurement is used primarily with supercomputers?
(a) Flops
(b) Fractions of second
(c) Gigahertz
(d) MIPS
(e) None of these
10. This type of software is designed for users who want to customize the programs they
use.
(a) Shareware
(b) Open-source software
(c) Freeware
(d) Macros (e) None of these
11. What is the term associated with the second part of an e-mail address?
(a) Local address
(b) Eight characters long
(c) User name
(d) Domain name
(e) None of these
12. A port that allows 8 bits at a time to be transmitted simultaneously is a (n) …..
(a) dedicated port
(b) parallel port
(c) SCSI port
(d) USB port
(e) None of these
13. In order for computers to communicate across a network, they must be connected
through a(n)…..
(a) TCP/IP
(b) Topology
(c) Ethernet
(d) Thin client
(e) None of these
(e) C. Rangarajan
14. What is a specialized software program that allows input and output devices to
communicate with the rest of the computer system?
(a) Utility driver
(b) Utility program
(c) Data compression utility
(d) Device driver
(e) None of these
15. Single party disk relying on the disk controller for finding out which disk has failed is
used by-
(a) RAID level 5
(b) RAID level 2
(c) RAID level 4
(d) RAID level 3
(e) RAID level 1
16. Which of these terms refers to the feature of an OS that allows a single computer to
process the tasks of several users at different stations, in round-robin fashion?
(a) Multiprocessing
(b) Multiprogramming
(c) Multitasking
(d) Time processing
(e) Time-sharing
17. Which of the following statements is not true about two-tier client-server database
architecture?
(a) SQL statements are processed on the server
(b) SQL statements may be processed on some of the clients
(c) Business logic is mostly processed on clients
(d) Business logic may be processed on the server
(e) None of these
18. A Relational operator that yields all values from selected attributes is known as a -
(a) difference
(b) product
(c) select
(d) project
(e) join
19. Normalization is:
(a) the process of creating small stable data structures from complex groups of data when
designing a relational database
(b) a methodology for documenting database illustrating the relationship between various
entities in the database
(c) an approach to data management that stores both data and the procedures acting on
the data as object that can be automatically retrieved and shared
(d) a representation of data as they would appear to an application programmer or user
(e) a representation of data as they actually would be organized on physical storage media
20. The process of building a model that demonstrate the features of a proposed product,
service or system is called a -
(a) JAD
(b) RAD
(c) templating
(d) prototyping
(e) TAD
21. Which of the following is mandatory component of a URL?
(a) Resource Path
(b) Protocol
(c) Port Number
(d) Domain Name
(e) None of these
22. DBMS allows you to extrapolate information from your data by using a-
(a) query language
(b) table generator
(c) report generator
(d) wizard
(e) None of these
23. A subschema is -
(a) a description of the physical and logical structure of data and the relationship among
the data
(b) a file that identifies the subset of data that a group of users can access
(c) a detailed description of all data contained in the database
(d) a description of the types of modifications that users can make to a database
(e) Either (c) or (d)
24. Which of the following is not a type of hub?
(a) Passive hub
(b) Inactive hub
(c) Switching hub
(d) Intelligent hub
(e) None of these
25. The ……….. lists the location of files on the disk
(a) FAT
(b) boot sector
(c) root folder
(d) data area
(e) None of these

Answers:
1. (b) 2. (a) 3. (a) 4. (a) 5. (b) 6. (b) 7. (e) 8. (a) 9. (a)
10. (a) 11. (d) 12. (b) 13. (b) 14. (d) 15. (d) 16.(e) 17.(c) 18. (d) 19. (a) 20. (d) 21. (e) 22.
(a) 23. (e) 24. (b) 25. (a)

ISRO EXAM QUESTION PAPER

Section - I
Quantitative Aptitude (Arithmetic)

1. Four prime numbers are written in ascending order of their magnitudes the
product of the first three is 385 and that of the last three is 1001. The largest given
prime number is
a. 11
b. 13
c. 17
d. 19
2. Mahavir deposited in the bank from Monday to Saturday the amounts of Rs.
87.80, Rs. 203.63, Rs. 3677.98, Rs. 92899.01, Rs. 66 and Rs. 554945.19 respectively.
Find his total deposit for this week
a. Rs. 651879.61
b. Rs. 652779.61
c. Rs. 650879.51
d. Rs. 655889.71
3. Amar deposited in Vijay Bank Rs. 259206.16 on Monday. Rs. 201890.48 on
Tuesday, Rs. 284.16 on Wednesday. He withdrew Rs. 50000.00 on Thursday. He
again deposited Rs. 230.01 on Friday and Rs. 72.62 on Saturday. Find his total
balance in the bank for this week
a. Rs. 501783.43
b. Rs. 501683.43
c. Rs. 511693.43
d. Rs. 511683.43
4. I was born on October 17, 1927. How old I was on Jan. 26, 1978?
a. 49 years and 101 days
b. 50 years and 100 days
c. 50 years and 101 days
d. 50 years and 103 days
5. Find the total of the following amount
Rs. 1230.79, Rs. 11368.08, Rs. 203.63, Rs. 10314.89, Rs. 64.8, Rs. 101.00 and Rs.
3677.98
a. Rs. 27961.1
b. Rs. 26961.17
c. Rs. 26951.17
d. Rs. 25961.17
6. How many pieces, each of length 4.5 m can be cut of 225 m of wire?
a. 40
b. 54
c. 56
d. 50
7. Parkash and Girish were travelling together. Prakash paid Rs. 200 for their stay
in a hotel and Girish paid taxi fare of Rs. 80. If they have to share these expenses
equally, then
a. Prakash should pay Rs. 60 to Girish
b. Girish should pay Rs. 120 to Prakash
c. Girish should pay Rs. 60 to Prakash
d. Prakash should pay Rs. 120 to Girish
8. Sum of the numbers from 1 to 20 is
a. 210
b. 110
c. 220
d. 105
9. Which of the following is equal to 115 x 15?
a. 105 x 10 + 115 x 5
b. 11 x 515
c. 1151 x 5
d. 110 x 15 + 5 x 15
10. The unit's digit in the sum (264)102 + (264)103 is
a. 0
b. 4
c. 6
d. 8
11. The smallest natural number by which the product of 3 consecutive even
numbers is always divisible is
a. 16
b. 32
c. 48
d. 96
12. The number of prime factors of (6)10 x (7)17 x (55)27 is
a. 54
b. 64
c. 81
d. 91
13. The total income of Hazari and Murari is Rs. 3000. Hazari spends 60% of his
income and Murari spends 80% of his income. If their savings are equal. Find the
income of Hazari
a. Rs. 2000
b. Rs. 3000
c. Rs. 1500
d. Rs. 1000
14. Bholanath save 25% if his income, but due to dearness the expenses increased by
25%, still he saves Rs. 30. Find his income
a. Rs. 400
b. Rs. 480
c. Rs. 450
d. Rs. 475
15. In a city 40% of the people are illiterate and 60% are poor. Among the rich 10%
are illiterate. What percentage of the poor population is illiterate?
a. 36%
b. 60%
c. 40%
d. None of these

Section - II
Mental Aptitude (Analytical Reasoning)

Directions (Q 1-5): Find the missing characters from the following series
1. ab _ a _ b _ a _ bba
a. aaab b. baba
c. abba d. baab
2. _ bc _ _ bb _ aabc
a. abab b. caab
c. acac d. aaab
3. cc _ a _ cabccb _ cca _ c _ ba
a. cbaba b. bacbc
c. bcabc d. abcbc
4. cba _ cb _ ccb _ c _
a. caac b. cbca
c. cbac d. cabc
5. aa _ cb _ aa _ _ bba _ ccb _
a. cabaac b. ababab
c. cbccab d. aaabca
6. If day before yesterday was Sunday then next Monday will be after ____ days.
a. 4 b. 5
c. 6
d. 7
7. If Sept 9 was Friday then the last Tuesday of the same Month will fall on
a. 25 b. 26
c. 27
d. 28
8. If the month of May begins on Sunday then the third Friday will fall on
a. 19 b. 20
c. 21
d. 22
9. If January 31 in a particular year falls on a Saturday then January 1 will be
a. Sunday b. Tuesday
c. Thursday d. Monday
10. At 6 PM the hour hand of a clock will point towards
a. North b. South
c. SW
d. SE
11. A boy walked 400 m north from his home, then he turned right and walked 100
m, then he turned left and walked 500 m. in which direction is he walking now
a. North b. South
c. NE
d. NW
12. A car starts from a point A. Then it moves 4 KM towards South. Then it turns
right and moves 3 KM. How far is it from point A now.
a. 3 KM b. 4 KM
c. 5 KM d. 0 KM
13. 3, 10, 29, 66, _
a. 137
b. 127
c. 103
d. 218
14. 41, 29, 19, 11, _
a. 5 b. 6
c. 4
d. 3
15. ZXUQ : ACFJ : : NLIE : :
a. KMQT b. KMPU
c. LMPT d. KMPT

Answers
Section - I Quantitative Aptitude (Arithmetic)
1. b, 2. a, 3. d, 4. c, 5. b
6. d, 7. c, 8. a, 9. d, 10. b
11. a, 12. d, 13. d, 14. b, 15. a

Section - II Mental Aptitude (Analytical Reasoning)
1. b, 2. c, 3. c, 4. a, 5. c
6. c, 7. c, 8. b, 9. c, 10. b
11. a, 12. c, 13. b, 14. a, 15. d

Friday, August 6, 2010

ISRO ECE 2009 QUESTION PAPER

ISRO ECE 2009 QUESTION PAPER CLICK HERE

ISRO SCIENTISTS/ENGINEERS (SC) SYLLABUS

ISRO SCIENTISTS/ENGINEERS (SC) ELECTRONICS ECE SYLLABUS

(1) Physical Electronics, Electron Devices and ICs:

Electrons and holes in semi-conductors, Carner Statistics, Mechanism of current flow in a semi-conductor, Hall effect; Junction theory; Different types of diodes and their characteristics; Bipolar Junction transistor; Field effect transistors; Power switching devices like SCRs, GTOs, power MOSFETs; Basics of ICs-bipolar, MOS and CMOS types; basic and Opto Electronics.

(2) Signals and Systems:

Classification of signals and systems; System modeling in terms of differential and difference equations; State variable representation; Fourier series; Fourier transforms and their application to system analysis; Laplace transforms and their application to system analysis; Convolution and superposition integrals and their applications; Z-transforms and their applications to the analysis and characterization of discrete time systems; Random signals and probability; Correlation functions; Spectral density; Response of linear system to random inputs.

(3) Network Theory:

Network analysis techniques; Network theorems, transient response, steady state sinusoidal response; Network graphs and their applications in network analysis; Tellegen’s theorem. Two port networks; Z, Y, h and transmission parameters. Combination of two ports, analysis of common two ports. Network functions: parts of network functions, obtaining a network function from a given part. Transmission criteria: delay and rise time, Elmore’s and other definitions effect of cascading. Elements of network synthesis.

(4) Electromagnetic Theory:

Analysis of electrostatic and magneto-static fields; Laplace’s and Poisson’s equations; Boundary value problems and their solutions; Maxwell’s equations; application to wave propagation in bounded and unbounded media; Transmission lines: basic theory, standing waves, matching applications, microstrip lines; Basics of wave guides and resonators; Elements of antenna theory.

(5) Analog Electronic Circuits:

Transistor biasing and stabilization. Small signal analysis. Power amplifiers. Frequency. response. Wide banding techniques. Feedback amplifiers. Tuned amplifiers. Oscillators, Rectifiers and power supplies. Op Amp, PLL, other linear integrated circuits and applications. Pulse shaping circuits and waveform generators.

(6) Digital Electronic Circuits:

Transistor as a switching element; Boolean algebra, simplification of Boolean function Karnaugh map and applications; IC Logic gates and their characteristics; IC logic families: DTL, TTL, ECL, NMOS, PMOS and CMOS gates and their comparison; Combinational logic circuits; Half adder, Full adder; Digital comparator; Multiplexer De-multiplexer; ROM and their applications. Flip-flops. R-S, J-K, D and T flip-tops; Different types of counters and registers. Waveform generators. A/D and D/A converters. Semi-conductor memories.

(7) Control Systems:

Transient and steady state response of control systems; Effect of feedback on stability and sensitivity; Root locus techniques; Frequency response analysis. Concepts of gain and phase margins; Constant-M and Constant-N Nichol’s Chart; Approximation of transient response from Constant-N Nichol’s Chart; Approximation of transient response from closed loop frequency response; Design of Control Systems; Compensators; Industrial controllers.

(8) Communication Systems:

Basic information theory; Modulation and detection in analogue and digital systems; Sampling and data reconstructions; Quantization and coding; Time division and frequency division multiplexing; Equalization; Optical Communication: in free space and fiber optic; Propagation of signals at HF, VHF, UHF and microwave frequency; Satellite Communication.

(9) Microwave Engineering:

Microwave Tubes and solid state devices, Microwave generation and amplifiers, Wave guides and other Microwave Components and Circuits, Microstrip circuits, Microwave Antennas, Microwave Measurements, Masers, Lasers; Micro-wave propagation. Microwave Communication Systems-terrestrial and satellite based.

(10) Computer Engineering:

Number Systems. Data representation; Programming; Elements of a high level programming language PASCAL/C; Use of basic data structures; Fundamentals of computer architecture; Processor design; Control unit design; Memory organization, I/o System Organization. Microprocessors: Architecture and instruction set of Microprocessor’s 8085 and 8086, Assembly language Programming. Microprocessor Based system design: typical examples. Personal computers and their typical uses.

ISRO SCIENTISTS/ENGINEERS (SC) COMPUTER SCIENCE CSE SYLLABUS

Theory of Computation: Regular languages and finite automata, Context free languages and Push-down automata, Recursively enumerable sets and Turing machines, Undecidability; NP-completeness.

Digital Logic: Logic functions, Minimization, Design and synthesis of combinational and sequential circuits; Number representation and computer arithmetic (fixed and floating point).

Computer Organization and Architecture: Machine instructions and addressing modes, ALU and data-path, CPU control design, Memory interface, I/O interface (Interrupt and DMA mode), Instruction pipelining, Cache and main memory, Secondary storage.

Programming and Data Structures: Programming in C; Functions, Recursion, Parameter passing, Scope, Binding; Abstract data types, Arrays, Stacks, Queues, Linked Lists, Trees, Binary search trees, Binary heaps.

Algorithms: Analysis, Asymptotic notation, Notions of space and time complexity, Worst and average case analysis; Design: Greedy approach, Dynamic programming, Divide-and-conquer; Tree and graph traversals, Connected components, Spanning trees, Shortest paths; Hashing, Sorting, Searching.

Compiler Design: Lexical analysis, Parsing, Syntax directed translation, Runtime environments, Intermediate and target code generation, Basics of code optimization.

Operating System: Processes, Threads, Inter-process communication, Concurrency, Synchronization, Deadlock, CPU scheduling, Memory management and virtual memory, File systems, I/O systems, Protection and security.

Databases: ER-model, Relational model (relational algebra, tuple calculus), Database design (integrity constraints, normal forms), Query languages (SQL), File structures (sequential files, indexing, B and B+ trees), Transactions and concurrency control.

Computer Networks: ISO/OSI stack, LAN technologies (Ethernet, Token ring), Flow and error control techniques, Routing algorithms, Congestion control, TCP/UDP and sockets, IP(v4), Application layer protocols (icmp, dns, smtp, pop, ftp, http); Basic concepts of hubs, switches, gateways, and routers.

ISRO SCIENTISTS/ENGINEERS (SC) MECHANICAL ME SYLLABUS

1. ENGINEERING MATHEMATICS

Linear Algebra: Algebra of matrices, system of linear equations, eigenvalues and eigenvectors.

Calculus: Taylor Series, Fourier Series, partial derivatives, total derivatives, definite and improper integrals, multiple integrals.

Vector Calculus: Gradient, divergence and curl, line and surface integrals, Green, Gauss and Stokes’ theorems.

Differential Equations: Linear ODE’s, first order non-linear ODE’s, initial and boundary value problems, Laplace transform, PDE’s-Laplace, wave and diffusion equations.

Numerical Methods: Solution of system of linear equations, interpolation, numerical integration, Newton-Raphson method, Runge-Kutta method.

Probability & Statistics: Gaussian, Weibul distribution and their properties, method of least squares, regression analysis, analysis of variance.

2. APPLIED MECHANICS AND DESIGN

Engineering Mechanics: Equivalent force systems, free-body concepts, equations of equilibrium, trusses and frames, virtual work and minimum potential energy. Kinematics and dynamics of particles and rigid bodies, impulse and momentum (linear and angular), energy methods, central force motion.

Strength of Materials: Stress and strain, stress-strain relationship and elastic constants, Mohr’s circle for plane stress and plane strain, shear force and bending moment diagrams, bending and shear stresses, deflection of beams torsion of circular shafts, thin and thick cylinders, Euler’s theory of columns, strain energy methods, thermal stresses.

Theory of Machines: Displacement, velocity and acceleration, analysis of plane mechanisms, dynamic analysis of slider-crank mechanism, planar cams and followers, gear tooth profiles, kinematics and design of gears, governors and flywheels, balancing of reciprocating and rotating masses.Vibrations: Free and forced vibration of single degree freedom systems, effect of damping, vibration isolation, resonance, critical speed of rotors.

Design of Machine Elements: Design for static and dynamic loading, failure theories, fatigue strength; design of bolted, riveted and welded joints; design of shafts and keys; design of spur gears, rolling and sliding contact bearings; brakes and clutches; belt, ropes and chain drives.

3. FLUID MECHANICS AND THERMAL SCIENCES

Fluid Mechanics: Fluid properties, fluid statics, manometry, buoyancy; Control-volume analysis of mass, momentum and energy, fluid acceleration; Differential equation of continuity and momentum; Bernoulli’s equation; Viscous flow of incompressible fluids; Boundary layer, Elementary turbulent flow; Flow through pipes, head losses in pipes, bends etc.

Heat-Transfer: Modes of heat transfer; One dimensional heat conduction, resistance concept, electrical analogy, unsteady heat conduction, fins; Dimensionless parameters in free and forced convective heat transfer, Various correlations for heat transfer in flow over flat plates and through pipes; Thermal boundary layer; effect of turbulence; Radiative heat transfer, black and grey surfaces, shape factors, network analysis; Heat exchanger performance, LMTD and NTU methods.

Thermodynamics: Zeroth, First and Second laws of thermodynamics; Thermodynamic system and processes; Irreversibility and availability; Behaviour of ideal and real gases, Properties of pure substances, calculation of work and heat in ideal processes; Analysis of thermodynamic cycles related to energy conversion; Carnot, Rankine, Otto, Diesel, Brayton and Vapour compression cycles.

Power Plant Engineering: Steam generators; Steam power cycles; Steam turbines; impulse and reaction principles, velocity diagrams, pressure and velocity compounding; Reheating and reheat factor; Condensers and feed heaters.I.C. Engines: Requirements and suitability of fuels in IC engines, fuel ratings, fuel-air mixture requirements; Normal combustion in SI and CI engines; Engine performance calculations.

Refrigeration and air-conditioning: Refrigerant compressors, expansion devices, condensers and evaporators; Properties of moist air, psychrometric chart, basic psychometric processes.

Turbomachinery: Components of gas turbines; Compression processes, Centrifugal and Axial flow compressors; Axial flow turbines, elementary theory; Hydraulic turbines; Euler-Turbine equation; Specific speed, Pelton-wheel, Francis and Kaplan turbines; Centrifugal pumps.

4. MANUFACTURING AND INDUSTRIAL ENGINEERING

Engineering Materials: Structure and properties of engineering materials and their applications, heat treatment.

Metal Casting: Casting processes (expendable and non-expendable) -pattern, moulds and cores, Heating and pouring, Solidification and cooling, Gating Design, Design considerations, defects.

Forming Processes: Stress-strain diagrams for ductile and brittle material, Plastic deformation and yield criteria, Fundamentals of hot and cold working processes, Bulk metal forming processes (forging, rolling extrusion, drawing), Sheet metal working processes (punching, blanking, bending, deep drawing, coining, spinning, Load estimation using homogeneous deformation methods, Defects). Processing of Powder metals- Atomization, compaction, sintering, secondary and finishing operations. Forming and shaping of Plastics- Extrusion, Injection Molding.

Joining Processes: Physics of welding, Fusion and non-fusion welding processes, brazing and soldering, Adhesive bonding, Design considerations in welding, Weld quality defects.Machining and Machine Tool

Operations: Mechanics of machining, Single and multi-point cutting tools, Tool geometry and materials, Tool life and wear, cutting fluids, Machinability, Economics of machining, non-traditional machining processes.

Metrology and Inspection: Limits, fits and tolerances, linear and angular measurements, comparators, gauge design, interferometry, Form and finish measurement, measurement of screw threads, Alignment and testing methods.

Tool Engineering: Principles of work holding, Design of jigs and fixtures. Computer Integrated Manufacturing: Basic concepts of CAD, CAM and their integration tools.

Manufacturing Analysis: Part-print analysis, tolerance analysis in manufacturing and assembly, time and cost analysis.

Work-Study: Method study, work measurement time study, work sampling, job evaluation, merit rating.

Production Planning and Control: Forecasting models, aggregate production planning, master scheduling, materials requirements planning.

Inventory Control: Deterministic and probabilistic models, safety stock inventory control systems.

Operations Research: Linear programming, simplex and duplex method, transportation, assignment, network flow models, simple queuing models, PERT and CPM.

Tuesday, July 6, 2010

ISRO Placement Paper

1.The minimum number of edges in a connected cyclic graph on n vertices is
a) n-1 b) n c) n+1 d)none of these
2.A full binary tree with n non leaf nodes contains
a) n nodes b) log n nodes c)2n-1 nodes d)2n nodes
3.The time complexity of shell sort
a) O(n) b) O(log n) c) O(n 1.2 ) d)O(n2)
4.The time taken to insert an element after an element pointed by some pointer
a) O(1) b) O(log n) c) O(n) d) O(nlogn)
5. what is the name given to the first generation computer?
a) Binary language b)Machine language c)Assembly language
6.The root directory of a disk should be placed
a) at a fixed address in main memory
b) at a fixed location on disk
c) anywhere on disk.
7.A top down parser generates
a) right most derivation
b) left most derivation
c) right most derivation in reverse
d) left most derivation in reverse
8.what is the name of the OS that reads and reacts in terms of actual time?
a)batch system
b)time sharing
c)real time
9.FDDI is a
a)ring network
b)star network
c)mesh network
10.Computer memory consists of
a)ROM
b)PROM
c)RAM
d)all the above

Friday, June 18, 2010

ISRO MODEL QUESTIONS

ISRO Question Pattern
 Test has 80 questions.

well there are several books available for preparing for ISRO.Any book which is prescribed for the GATE
preparation would do sufficiently. 
Computer Organization---William Stallings,Morris Mano
Theory of Computation---Aho and Ullman
Compiler Design-----Ullman
Operating systems----Galvin
computer Networks----William Stallings 
apart from these for apptitude and General Knowledge
Refer some good magazines like CSR, Manorama Year book for GK sample gk questions and R.S Agarwal
                                                                                                                        
INTERVIEW
SAC(Ahmedabad) panel comprised of 6 members, very senior scientists. They asked about B.E project, subject questions were picked up from the B.E project. Like if ur project is on Commn, they asked questions from Commn.
At NIT, Trichy ISRO dropped in for campus recruitment, panel members were from ISRO Trivandrum and ISRO Bangalore with some 20 years of experience in ISRO.

3 people on the whole were in the panel. 1 was an expert in microwaves another person with reg to DSP, Digital Commn, VLSI, third person was chairman, I believe They first made the usual formalities like doc verification and the usual questions like Did u appear for GATE? How did u come 2 NIT, Trichy for PG (GATE / NON GATE)?? What was ur rank in the entrance test conducted by NITT to get in for PG programme??
Then they asked abt my M.E project. Here at NITT, we have phase-1 proj and phase-2 proj at 3rd and 4th sem course.
So i told that I am working with IP over WDM networks. They asked me from WDM technology, to compare microwave and fiber optics, guided and unguided commn differences??, WDM components, about IPv6.

2nd member asked me from microwaves . Some questions raised by him

-Eqvt ckt of transmission line and explain all the primary and secondary constants?
- losses associated with transmission line
-antenna gain, isotropic antenna?, antenna applns at different freq
-microwave sources - klystron, magnetron etc.
3rd member asked me from digital commn
- Sampling theorem, aliasing effects, digital modn (compare BPSK and BFSK), what is FFSK?, line coding (compare manchester and NRZ scheme), turbo codes??, trellis coded modulation??, advantage of cyclic codes
some questions from spread spectrum also - like how anti jamming is achieved??
altogether only basic fundas here also. Confidence is the key and it's better to have a firm grasp on the subjects related to project.
Since the panel members were old ppl, questions from microwaves, antennas, trans lines are sure to comeforth.
Infact questions from microwave engg, antennas and t.lines were asked for all people.
                                                                                                                   
Sample questions asked in ISRO board (ECE)

1) How does a satellite communication work?
2) Why numerical methods used in research?
3) Hell lot of questions in TV engineering like horizontal and vertical frequencies, what will happen if they are reversed, interlaced scanning, PAL and some other questions.
4) Basic digital questions
5) Basic communications like SSB, AM, FM, VSB and what will happen if AM and FM is interchanged in TV transmission.
6) Some questions on project.

Main model of technical question in exam are
Direct theory question.
Direct numerical problem.
Indirect theory and numerical problem.
Graph based questions.
Assertion and reasoning type
Block diagram based (control theory)

ISRO Sample Question


  1. The root directory of disk should be placed at___   
  2. DNS is basically used to ____
  3. one more ques on DNS
  4. abt TCP and UDP
  5. TCP's which layer is there for the OSI's first three layers.
  6. Multiprocessing models have---          a)symmetric 
        b)unsymmetric models 
        c)none of the above 
        d) both
  7.  BCDhave binary nos in           a)bis  
             b) bytes 
             c)nibble
  8. Top-down parser ....
            a) leftmost derivation
            b)rightmost derivation
            c)leftmost derivation in reverse
            d)rightmost derivation in reverse
  9. Loop which avoids check at every iteration
       a) loop controlling 
      b) loop jamming
  10. one tree was given and some expressions were there and we have to find the correct postfix exprn
     
  11. abt logic gates
  12. worst case of Shell sort
  13. sine wave can be split into    
         a)set of sine waves
         b)set of sine waves with phase zero
  14. Full binary tree with n vertices has how many leaf nodes  somethng like this...
  15. Complete graph with n vertices and somethng
  16. in a cyclic graph with n vertices how many minimum edges
           a)n 
          b)n/2... 
ISRO Sample Papers
  1. The minimum number of edges in a connected cyclic graph on n vertices is
     a) n-1 b) n c) n+1 d)none of these 
  2. A full binary tree with n non leaf nodes contains
     a) n nodes b) log n nodes c)2n-1 nodes d)2n nodes 
  3. The time complexity of shell sort  
     a) O(n) b) O(log n) c) O(n 1.2 ) d)O(n2) 
  4. The time taken to insert an element after an element pointed by some pointer  
     a) O(1) b) O(log n) c) O(n) d) O(nlogn) 
  5. what is the name given to the first generation computer?  
    a) Binary language b)Machine language c)Assembly language 
  6. The root directory of a disk should be placed  
    a) at a fixed address in main memory
    b) at a fixed location on disk
    c) anywhere on disk. 
  7. A top down parser generates
    a) right most derivation
    b) left most derivation
    c) right most derivation in reverse
    d) left most derivation in reverse 
  8. what is the name of the OS that reads and reacts in terms of actual time?
     a)batch system
     b)time sharing
     c)real time 
  9. FDDI is a
     a)ring network
     b)star network
     c)mesh network 
  10. Computer memory consists of
    a)ROM
    b)PROM
    c)RAM
    d)all the above 

    ISRO Model Interview

    Hope you all have started the planning for the DRDO test. This is a golden opportunity to clear the test. Why? You have all the resources and books in your hand. Any way many of you have asked how to apply for ISRO? Organizations like ISRO, VSSC etc don’t conduct tests as DRDO do. They give ad in newspaper. They short list based on the percentage and call for interview. Or they directly go to the premier institutes and recruit directly from there.
    I am giving a pattern of questions asked for an ECE guy in ISRO-SAC interview. Once again I have to stress that if ur basics are strong you will get thru the interview. Now from very long time I am telling learn the basics. What are the basics?
    Here are examples:
    1. In radar we may know how a CW radar works and what are its applications. That’s not enough! You should know why the CW can be used in those applications and what types of radar can be used in those applications other than CW radar.
    2. In digital we know how to reduce a Boolean expression using K-map. But do you know difference between looping 1s and 0s in K-map? Do you know there is a limitation in Kmap? Do you know any other method to reduce the expressions? Is there any limitation for that?
    3. In mechanical we have heard a lot about 100cc or 150 cc bikes. What actually  cc here means? Is there any relationship with that with performance if so how and why?
    Is there any 100% efficient Carnot cycle? Why?
    4. In electrical we have heard a lot about transmission loss why it is caused? Can we prevent it ?
    5. In Computer you know methods of sorting? Which is the most efficient and why?
    6. In Physics do you know what is the cause of hall effect?

    Now have a first hand experience of an ISRO interview.
     SAC (Ahmedabad) panel comprised of 6 members, very senior scientists. They asked about B.E project, subject questions were picked up from the B.E project. Like if your project is on Commn, they asked questions from Commn.
    At NIT, Trichy ISRO dropped in for campus recruitment, panel members were from ISRO Trivandrum and ISRO Bangalore with some 20 years of experience in ISRO.

    3 people on the whole were in the panel. 1 was an expert in microwaves another person in DSP, Digital Commn, VLSI, third person was chairman, I believe

     They first made the usual formalities like doc verification and the usual questions like Did u appear for GATE? How did u come 2 NIT, Trichy for PG (GATE / NON GATE)??  What was your rank in the entrance test conducted by NITT to get in for PG?

    Then they asked abt my M.E project. Here at NITT, we have phase-1 project and phase-2 project at 3rd and 4th semester course.

    So i told that I am working with IP over WDM networks. They asked me from WDM technology, to compare microwave and fiber optics, guided and unguided commn differences? WDM components, about IPv6.

    2nd member asked me from microwaves. Some questions raised by him

     - Eqvt ckt of transmission line and explain all the primary and secondary constants?

    - losses associated with transmission line

    -antenna gain, isotropic antenna?, antenna applns at different freq

    -microwave sources - klystron, magnetron etc.

    3rd member asked me from digital commn

    - Sampling theorem, aliasing effects, digital modulation (compare BPSK and BFSK), what is FFSK?, line coding (compare Manchester and NRZ scheme), turbo codes??, trellis coded modulation??, advantage of cyclic codes

    some questions from spread spectrum also - like how anti jamming is achieved??

    Altogether only basic fundas here also. Confidence is the key and it's better to have a firm grasp on the subjects related to project.

    Since the panel members were old people, questions from microwaves, antennas, trans lines are sure to come forth.

    In fact questions from microwave engineering, antennas and transmission lines were asked for all people.
ISRO Interview
NOTE: this recruitment drive is also recruiting scientist for NTRO(National Technical Research Org, a newly started private R&D in same field). NTRO has requested ISRO to recruit some candidates for it. Toppers will be absorbed by ISRO and later students will be offered NTRO. before interview you will be asked  about whether you want yourself to be considered for NTRO also or not.
  1. There were 8 person in panel and only one panel was there. there was a long round table between candidate and interviewers so we have to explain everything on board.
  2. They asked about GATE score card ,percentile, why did not went for M.Tech. If you are doing M.Tech. or Job they may ask questions in your specialization
  3. Tell about your project
  4. Then some questions regarding project
  5. Favourite subjects ( I said DSA, C and DBMS . I didn't said OS because for OS they were asking w.r.t. Linux. In CN they may also ask general about Network Security ,firewall, encryption etc. CA include Digital, Microprocessor etc)
  6. They are giving everybody a question from mathematics to solve on board, mostly to find the rank of matrix, solving linear equation (some tricky which can be answered without solving it properly) or probability.
  7. They may give a K - Map to solve on board
  8. In C(i told C as My favourite subject) they ask me about extern, static, linking, global variables, run time library , exit etc.
  9. In DSA they ask me about ex-pression evaluation infix ,postfix, how ex-pression is evaluated etc
  10. Solve the equation x+y=5    ; 4x+4y=12; x+2y+3Z=20 .Answer: no solution since first two are contradicting so not possible
  11. Some Other info about Interview
    Mostly interview is on basics not deep into subject

    1.In CS at Ahmedabad On 12 Sept only one out of 37 was asked about the project but on 13 everybody was asked about project
2.They are asking some very basic questions from Digital like K-map solving , gates etc

3.Generally DBMS was not asked

Tuesday, June 15, 2010

ISRO Scientist/Engineer Exam Electronics Syllabus

ISRO Scientist/Engineer Exam Electronics Syllabus



(1) Physical Electronics, Electron Devices and ICs:


Electrons and holes in semi-conductors, Carner Statistics, Mechanism of current flow in a semi-conductor, Hall effect; Junction theory; Different types of diodes and their characteristics; Bipolar Junction transistor; Field effect transistors; Power switching devices like SCRs, GTOs, power MOSFETs; Basics of ICs-bipolar, MOS and CMOS types; basic and Opto Electronics.

(2) Signals and Systems:

Classification of signals and systems; System modeling in terms of differential and difference equations; State variable representation; Fourier series; Fourier transforms and their application to system analysis; Laplace transforms and their application to system analysis; Convolution and superposition integrals and their applications; Z-transforms and their applications to the analysis and characterization of discrete time systems; Random signals and probability; Correlation functions; Spectral density; Response of linear system to random inputs.

(3) Network Theory:

Network analysis techniques; Network theorems, transient response, steady state sinusoidal response; Network graphs and their applications in network analysis; Tellegen's theorem. Two port networks; Z, Y, h and transmission parameters. Combination of two ports, analysis of common two ports. Network functions: parts of network functions, obtaining a network function from a given part. Transmission criteria: delay and rise time, Elmore's and other definitions effect of cascading. Elements of network synthesis.

(4) Electromagnetic Theory:

Analysis of electrostatic and magneto-static fields; Laplace's and Poisson's equations; Boundary value problems and their solutions; Maxwell's equations; application to wave propagation in bounded and unbounded media; Transmission lines: basic theory, standing waves, matching applications, microstrip lines; Basics of wave guides and resonators; Elements of antenna theory.

(5) Analog Electronic Circuits:

Transistor biasing and stabilization. Small signal analysis. Power amplifiers. Frequency. response. Wide banding techniques. Feedback amplifiers. Tuned amplifiers. Oscillators, Rectifiers and power supplies. Op Amp, PLL, other linear integrated circuits and applications. Pulse shaping circuits and waveform generators.

(6) Digital Electronic Circuits:

Transistor as a switching element; Boolean algebra, simplification of Boolean function Karnaugh map and applications; IC Logic gates and their characteristics; IC logic families: DTL, TTL, ECL, NMOS, PMOS and CMOS gates and their comparison; Combinational logic circuits; Half adder, Full adder; Digital comparator; Multiplexer De-multiplexer; ROM and their applications. Flip-flops. R-S, J-K, D and T flip-tops; Different types of counters and registers. Waveform generators. A/D and D/A converters. Semi-conductor memories.

(7) Control Systems:

Transient and steady state response of control systems; Effect of feedback on stability and sensitivity; Root locus techniques; Frequency response analysis. Concepts of gain and phase margins; Constant-M and Constant-N Nichol's Chart; Approximation of transient response from Constant-N Nichol's Chart; Approximation of transient response from closed loop frequency response; Design of Control Systems; Compensators; Industrial controllers.

(8) Communication Systems:

Basic information theory; Modulation and detection in analogue and digital systems; Sampling and data reconstructions; Quantization and coding; Time division and frequency division multiplexing; Equalization; Optical Communication: in free space and fiber optic; Propagation of signals at HF, VHF, UHF and microwave frequency; Satellite Communication.

(9) Microwave Engineering:

Microwave Tubes and solid state devices, Microwave generation and amplifiers, Wave guides and other Microwave Components and Circuits, Microstrip circuits, Microwave Antennas, Microwave Measurements, Masers, Lasers; Micro-wave propagation. Microwave Communication Systems-terrestrial and satellite based.

(10) Computer Engineering:

Number Systems. Data representation; Programming; Elements of a high level programming language PASCAL/C; Use of basic data structures; Fundamentals of computer architecture; Processor design; Control unit design; Memory organization, I/o System Organization. Microprocessors: Architecture and instruction set of Microprocessor's 8085 and 8086, Assembly language Programming. Microprocessor Based system design: typical examples. Personal computers and their typical uses.