ISRO Placement Modal Paper

Hey there! Would you please provide me ISRO placement papers???

[Raman Vij]

ISRO known as Indian Space Research Organization. ISRO is controlled by the Indian Government. The modern form of ISRO was created way back in the year 1969. ISRO’s headquarter is located in the city of Bangalore.

ISRO launches its satellites from Sriharikota.
ISRO recruits Lots of engineers from various fields like Mechanical, Electrical, Electronics and Communication, Instrumentation, Control, Computer Science etc.

ISRO Placement Questions:

Following is the question which has been asked in ISRO placement exam:

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

Model Papers:
If you want to get Modal papers of ISRO placement exam, download this pdf file:

Modal Papers of ISRO Placement Exam

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

Hi friends,
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.

I want previous 5 years question papers for mechanical engineers but I dont have any log in credentials.Please help.


Regards
Guruprasad