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ISRO Previous Year Papers, Get Latest (CSE/ECE/Mechanical) Sample Paper

ISRO Previous Year Papers

Aspiration to Work for ISRO Then, Must Qualify CSE/ECE/Mechanical & Others Exams by preparing through ISRO Previous Year Papers, You Can also Get Latest Sample Papers Through This Page For Well Preparation. Aspirants, who’re going to appear in ISRO Exam for different streams, are advised to begin their preparation through ISRO Last Year Papers to score well in examination. Candidates can download the ISRO Previous Year Papers With Solution for free through online mode in pdf format from this page.

Indian Space Research Organization, every year organizes various exams to select result oriented and skilled contenders for various posts. Applicants can check ISRO Sample Question Papers which asked in the previous years and get a preplan of techniques to solve them by practicing with these questions. Candidates please have a glance on below mentioned ISRO Previous Year Question Papers provided by the team members of

ISRO Previous Year Question Papers

ISRO Scientist Engineer Previous Papers (Stream Wise)Years Wise Question Papers In Pdf
ElectricalSC Electrical QPSC Electrical QP
CivilSC Civil QPSC Civil QP
Refrigeration and Air ConditioningSC Refrigeration & Air Conditioning QPSC Refrigeration & Air Conditioning QP
Computer ScienceSC Comp. Science QPSC Computer Science QP
MechanicalSC Mechanical QPSC Mechanical QP
ElectronicsSC Electronics QPSC Electronics QP

Essential Note

  • SC: Scientist Engineer
  • QP: Question Paper

ISRO Previous Year Question Papers for ECE:

2006Download Now
2007Download Now
2008Download Now
2009Download Now
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ISRO Questions & Answers

Ques:1 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


c) 1:1

d) 1:4

Ans: (c)

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Ques:2 If sampling frequency doubles then

a) Quantization noise decreases

b) Quantization density decreases

c) Quantization noise increases

d) Quantization density increases

Ans: (a)

Ques:3 The high gain codes are

a) Turbo codes

b) BCH codes

c) R-S codes

d) None of the above

Ans: (a)

Ques:4 For an air-conditioning system, the outdoor and indoor design dry bulb temperature are 45o C and 25oC respectively. The space to be air-conditioned is 20 m X 30m X 5 m and infiltration is estimated to be one air change. If the density and specific heat of air are 1.2 (kg of dry air)/m3 and 1.02 kJ/(Kg of dry air)oC, then the sensible heat load due to infiltration is nearly

(a) 122.4 kW

(b) 61.2 kW

(c) 12.24 kW

(d) 20.4 kW

Ans: (d)

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Ques:5 With respect to I.C. engine emission, consider the following statements :

1.   Evaporative emissions have no carbon monoxide and oxides of nitrogen

2. Blow by emission are essentially carbon monoxide and suspended particulate matter

3. Exhaust emissions contain 100% of carbon monoxide , 100 % of oxides of nitrogen and around 50-55% of hydrocarbons emitted by the engine.

4. There are no suspended particulates in the exhaust.

Of these statements

(a) 1 and 4 are correct

(b) 1 and 3 are correct

(c) 2 and 3 are correct

(d) 1,2,3 and 4 are correct

Ans: (c)

Ques:6 Time constant of a series R-L circuit is given by

a) LR

b) L/R

c) L2R

d) LR2

Ans: (b)

Ques:7 In a new temperature scale say op, the boiling and freezing points of water at one atmosphere are 100op and 300op respectively. Correlate this scale with the Centigrade scale. The reading of 0o p on the Centigrade scale is

(a) 0oC

(b) 50oC

(c) 100oC

(d) 150oC

Ans: (d)

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Ques:8 The Q factor of a series RLC increases if

a) R decreases

b) R increase

c) impedance increases

d) voltage increases

Ans: (a)

Ques:9 Consider a set of n tasks with known runtimes r1,  r2 ………  rn, to be run on a uniprocessor machine.  Which of the following processor scheduling algorithms will result in the ma throughput ?

(a) Round Robin

(b) Shortest job first

(c) Highest response ratio next

(d) first cum first served

Ans: (b)

Ques:10 The working temperature in the evaporator and condenser coils of a refrigerator are -30oC and 32oC respectively. If the actual refrigerator has a C.O.P of 0.75 of the maximum. the required power input for a refrigerating effect of 5 kW is, nearly,

(a) 1.7 kW

(b) 2.94 kW

(c) 3.92 kW

(d) 4.0 kW

Ans: (a)

Ques:11 The forbidden energy gap for silicon is

a) 0.12 eV

b) 1.12 eV

c) 0.72 eV

d) 0.92 eV

Ans: (c)

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Ques:12 Number of h parameters of a transistors are

a) 1

b) 2

c) 3

d) 4

Ans: (d)

Ques:13 The principal of locality of reference justifies the use of

(a) virtual memory

(b) interrupts

(c) main memory

(d) cache memory

Ans: (d)

Ques:14 For an-conditioned space, RTH = 100 kW; RSHF = 0.75, volume flow rate is equal to 100 m3/minute and indoor design specific humidity is 0.01 kg/(kg of dry air). The specific humidity of supply air is

(a) 0.010

(b) 0.0075

(c) 0.005

(d) 0.0025

Ans: (c)

Ques:15 The critical value of Reynolds number for transition from laminar to turbulent boundary layer in external flows is taken as

(a) 2300

(b) 4000

(c) 5 x 105

(d) 3 X 106

Ans: (a)

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Ques:16 An op-amp when used as a notch filter has a notch frequency = 2kHz, low frequency point = 2.2 kHz. The Q of the notch is

a) 0.5

b) 5

c) 0.2

d) 2

Ans: (b)

Ques:17 Demodulation

a) is performed at the transmitting station

b) removes side bands

c) rectifies modulated signal

d) is opposite of modulation

Ans: (d)

Ques:18 The five items :  A, B, C, D,  and E are pushed in a stack, one after the other starting from A.  The stack is popped four times and each element is inserted in a queue. Then two elements are deleted from the queue and pushed back on the stack. Now one item is popped from the stack.  The popped item is

(a) A

(b) B

(c) C

(d) D

Ans: (d)

Ques:19 In the operation of four-stroke diesel engines, the term ‘squish’ refers to the

(a) injection of fuel ! in the precombustion chamber

(b) discharge of gases from the precombustion chamber

(c) entry of air into the combustion chamber

(d) stripping of fuel from the core

Ans: (a)

Ques:20 Which of the following modulating system is digital ?

a) PPM

b) PWM

c) PCM

d) PEM

Ans: (c)

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One Response to "ISRO Previous Year Papers, Get Latest (CSE/ECE/Mechanical) Sample Paper"

  1. Arya Mohan.S.

    helpful one

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