ISRO Mock Test 2

ISRO MOCK TEST 2

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 ISRO Important concepts - Click Here

1) Quality Factor of an RL circuit having Xl=100 ohms is 50 then R and Dissipation factor (DF) will be ?

R=2ohms, DF=2
R=0.02 ohms, DF=2
R=2 ohms, DF=0.02
R=2 ohms, DF=100

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2) DFT of {2,2,0,1} ?

5,2+j,1,2-j
5,2-j,-1,2+j
5,2-j,2-j,1
5,2+j,-2+j,1

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3) Minimum number of satellite views required to find exact position of a point on earth in GPS?

4
3
2
1

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4) The term "Cycle Stealing" related to?

Programable Peripheral Interface
Programable Timer
Direct Memory Access
Virtual Memory

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5) Zener Diode works on the Principle

Thermionic emission
Tunneling
Avalanche Breakdown
Diffusion

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6) An op amp has differential gain of 120dB and common mode gain of 20dB then CMRR

140dB
100dB
80dB
60dB

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7) Class B power amplifier has conduction angle of

360 degrees
270 degrees
120 degrees
180 degrees

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8) An EM wave of the form Ex=5Cos(wt+Bz) propagate along direction

+X
+Z
+Y
-Z

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9) Bode plot is applicable for?

Maximum Phase system
Minimum Phase system
All pole system
All zero system

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10) A non sinusoidal signal has Vpp 2v is represented using 128 level quantizer has SNR of ?

46.8dB
40.8dB
52.8dB
56.8dB

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11) A modulated signal of the form 6cos(Wc.t+3/4sinWm.t) has total power of

36 W
18 W
72 W
54 W

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12) Minimum Number of NAND gates required to implement XOR?

4
5
9
10

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13) A periodic signal of the form 5cos100πt+6sin200πt has a Nyquist Frequency

50Hz
100Hz
150Hz
200Hz

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14) VSWR of a Perfectly Mismatched line?

∞
zero
1
100

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15) A GEOsynchronous Satellite will lie with?

0 degrees inclination with equitorial plane
some non zero angle inclination with equitorial plane
will not lie in equitorial plane
none

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16) Matrix A has Multiplicity of

4
3
2
1

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17) which modelling has highest level of Abstraction

Gate Level
Switch Level
Data Flow
Behavioral

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18) Which architecture support variable length instruction type

CISC
RISC
both a & b
none

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19) Which filters are stable

FIR
IIR
Both
none

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20) Find Rth of following circuit in ohms

4
3
5
10

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21) If cache has access time 120nsec hit ratio 0.8 and main memory access time 400nsec then average access time

176ns
276ns
576ns
520ns

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22) GPS system of INDIA called as

GALILEO
GLONASS
GAGAN
COMPASS

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23) In BSR mode of 8255 which port bits are set/reset?

Port A
Port B
Port C
All

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24) Intrinsic concentration of Ge is 1.5*10^10 doped with donor concentration of 10^9 then at thermal equilibrium acceptor Concentration should be

1.5*10^11
2.25*10^11
1.5*10^9
2.25*10^9

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25) An EM wave in free space having E=4i+4j+2k is normally incident on a plane y=0 having ϵr=4 then transmitted wave?

4i+j+4k
4i+4j+k
4i+j+2k
4i+j+k

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26) A system of the form

Controllable & Observable
Not Controllable & Observable
Controllable & Not Observable
Not Controllable & Not Observable

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27) QAM is a

Phase Modulated signal
Amplitude Modulated signal
both
none

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28) A DSB-SC signal having message frequency 500Hz is passed through filter having upper sideband resultant signal will have bandwidh of

1000Hz
500Hz
250Hz
2000Hz

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29) In RS flipflop when both inputs are high output will be ?

Toggled state
Logic 1
Logic 0
Indeterminant state

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30) According to final value theorem Laplace transform {u(t-a)}will have value

0
Infinity
1
-1

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31) In a TEM mode ____ is perpendicular to the direction of propagation

Electric Field
Magnetic Field
both
none

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32) Which of the following is the orbital effect in satellite communication

Power failure
dispersion effect
multipath effect
sun transit-outage

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33) If

then

       

2u
6u
u
3u

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34) keyword $strobe is used in verilog

to execute only after other statements in same time unit are executed
to enable communication between blocks
to act as trigger
to invoke lower blocks

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35) Impedance in parallel RLC circuit is

Resistive, Maximum
Reactive, Minimum
Resistive, Minimum
Reactive, Maximum

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36) For which IIR filter magnitude has ripples in passband

Butterworth
Chebyshev Type-1
Chebyshev Type-2
elliptical

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37) In IOS model which layer deals with Network topology of system

Physical Layer
Network Layer
Transport Layer
Security Layer

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38) The orbital period of a satellite in circular orbit of radius R from center of earth is proportional to

R^1/2
R^3/2
R^2
R

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39) In PN junction Diode Reverse saturation current(Io) at 10 degree C is 10uA at 40 degrees what will be Io

40uA
80uA
20uA
10uA

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40) In BJT which Stability bias technique gives High Stability

Fixed Bias
Collector to Base Bias
Fixed Bias with emitter resistance
Self Bias

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41) In a wave guide dominant mode will have

Min Cut-off Frequency
Max Cut-off Frequency
No Cut-off Frequency
none

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42) A system has a characteristic equation S^3 + 2S^2 +1=0

Absolutely Stable
Marginally Stable
Unstable
none

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43) ASK modulated signal is transmitted in free space as data packets of 5 blocks, each block consists of 10bits of duration 1ms will have Bandwidth

200KHz
100KHz
400KHz
50KHz

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44) An FM signal have Frequency deviation of 200Hz and message signal frequency of 100Hz will have figure of merit

6
3
12
4

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45) Carry of Full Adder is also called as Boolean function of

Majority Voting
Minority Voting
Don't care
High Z

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46) Slow wave structure are used in TWT to

Reduce Electron beam speed
Reduce RF speed
Reduce Gain
Reduce Bandwidth

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47) In which of the following tracking Radars antenna beam is continuously rotated

Sequential lobing
Conical scan
Mono pulse tracking radar
none

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48) Which of the following is a non blocking assignment statement in Verilog HDL

=
≠
<=
>>

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49) Number of equations required to solve a network having 6 Branches and 4 nodes

2
3
4
6

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50) In a BJT Vbe=0.7v Vce=0.2v operates in

Active mode
Saturation mode
Cutoff mode
Inverse active mode

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51) A series RL circuit have R=4 ohms and Xl=3 ohms with voltage source of 5V have apparent power of circuit

5 W
2.5 W
4 W
10 W

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52) When Compared to BJT. FET has

Low Bandwidth
High Bandwidth
Low input Impedance
High Gain

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53) The Circuit will act as

High Pass Filter
Band Pass Filter
Low Pass Filter
Band Stop Filter

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54) Radiation resistance of a Hertizian dipole in ohms

36.5
73
80
100

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55) Response of a system for unit step input is 1. The response of unit ramp will be

u(t)
tu(t)
1
t^2u(t)

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56) Probability of error for BFSK is given by

Q(sqrt(Eb/No))

Q(sqrt(2Eb/No))
Q(sqrt(Eb/2No))
Q(sqrt(Eb/4No))

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57) Indirect method of Wide Band FM generation called as

Armstrong Method
Balanced Modulator
Voltage Controlled Oscillator
Square law modulator

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58) given x(y+wz)=xy+xwz

1

2

3

4

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59) Z{x[n-k]}

1)

2)

3) X[z]
4) zX[z]

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60) Given circuit will have time constant of

L/R
2L/R
L/2R
L/4R

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61) To move data to the external memory which command is used in micro controller

MovC
Mov
MovX
MVI

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62) Fabrication of buried layer n-p-n transistor process involves is a) lithography b) epitaxy c) diffusion d) oxidation

abcd
acbd
adbc
acdb

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63) which power amplifier has maximum efficiency is

Class A
Class B
Class A transformer coupled
Class D

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64) Entropy of 5 symbols having probability 1/2,1/8,1/8,1/8,1/8

5
2
3
4

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65) A Counter is designed to count following states 000, 001, 010

mod 2
mod 3
mod 4
mod 5

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66) Signal have period cos(πt/3)+sin(πt/4)

6
8
24
12

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67) Inductance of Inductor having 30 turns is 8H if turns reduced to 15 the inductance will be

16H
2H
32H
64H

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68) output voltage of following circuit

-20V
20V
5V
-10V

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69) An EM wave of the form E=5cos(10^8t-3z) in a medium has ∈r

9
3
81
27

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70) Nyquist plot is a

Cartesian Plot
Logarithm Plot
Spectrum
polar plot

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71) Coding gain is

Voltage gain
Current gain
Power gain
Energy per bit saved by using special codes to achieve same BER as uncoded

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72) Number of 1k*4 ICs required to form 8k*8

2
8
16
12

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73) which of the following is a microwave antenna

Rhombic Antenna
V-antenna
Log-antenna
Horn antenna

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74) Value of -Vx in the shown circuit such that maximum power is delivered through Rl

50V
-50V
100V
-100V

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75) An 8085 executes following instructions
2810 LXI H,30B0H
2813 DAD H
2814 PCHL
what will be values of PC, HL at the end of this code

PC=2716H ,HL=30B0H
PC=30B0H , HL=2716H
PC=30B0H , HL=30B0H
PC=6160H , HL=6160H

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76) In a PI controller by addition of a pole result in

System stability Increases and Steady state error Increases
System stability decreases and Steady state error Increases
System stability Increases and Steady state error decreases
System stability decreases and Steady state error decreases

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77) In a transmission line having source power of 100W having Zo=50 ohms power delivered to load of 150 ohms is      

25 W
75 W
50 W
100 W

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78) Out put signal of the following circuit will have period

2msec
1msec
100usec
200usec

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79) In Transformer the losses that vary with load current

Core loss
Hysterisys loss
Eddy current loss
Copper loss

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80) In an n-channel MOSFET parameters Vtn=2V, Kn=1ma/v2 Vgs=5V and Vds=6V then Id is

5mA
6mA
9mA
3mA

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ISRO Mock Test

ISRO MOCK TEST 1

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 ISRO Important concepts - Click Here

1) Number of states does a 4-bit Ring Counter have ?

2
1
4
8

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2) Tunnel Diode works on the principle of ?

Thermionic emission
Voltage Regulation
BreakDown
Tunneling

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3) Compared to centre tapped Full wave Rectifier Bridge rectifier have low requirement of?

peak inverse voltage
Number of diodes
Current(rms)
Ripple Factor

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4) For maximum power transfer in a circuit having Source impedance of 5 +j3 load impedance should be?

8-j3
5-j3
3+j5
5+j3

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5) According to maxwells equation ∇.D=

Q
Pl
Ps
Pv

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6) If a system has H(s)=1/s then unit step response

tu(t)
u(t)
t^2u(t)
tu(t)/2

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7) What will be the image frequency for signal of 1100Hz with IF=450Hz

1000Hz
2000Hz
1500Hz
1550Hz

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8) If slope of the signal m(t) = 2cos(50t) is 50 in Delta Modulation results in

Slope overload error
Granular noise error
No error
Quantization error

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9) In a BJT Beta = 99, Icbo=10uamp, Iceo=?

20ma
2ma
1ma
10ma

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10) Darlington pair made of two similar transistors have B=100 each then equivalent B=?

1000
100
10
10000

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11) Following circuit have Time constant of

RC
2/3RC
3/2RC
2RC

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12) A wave guide act as?

Band pass filter
High pass filter
Band Stop filter
Low pass filter

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13) which flip-flop is called as transparent latch

T flip-flop
JK flip-flop
D flip-flop
RS flip-flop

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14) If bitrate of QPSK transmission is 4kbps then its bandwidth

4Khz
8Khz
12Khz
6Khz

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15) A phase modulated message signal of 1Khz with modulation index of 1.5 will have Bandwidth of?

4Khz
5Khz
2.5Khz
1.5Khz

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16) poles of absolutely stable system will lie on which side in s-plane?

Left side
Right side
at origin
on imaginary axis

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17) what should be the minimum load resistant of given circuit

100 ohms
50 ohms
66.7 ohms
87.6 ohms

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18) Which of the following circuit act as DC Restorer or Level shifter

Clipper
Clamper
Resonant circuit
Tank Circuit

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19) In RLC series resonant circuit at Fo

Current will be Maximum
Current will be Minimum
Impedance is Maximum
Impedance is reactive

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20) When left circularly polarized signal of power 5dB is received by linearly polarized antenna then received signal strength will be

0dB
5dB
2dB
1dB

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21) Which of the following circuit can be used to generate 1ms pulse from 1us pulse

BootStrap
MonoStable Multivibrator
Bistable Multivibrator
Schmitt Trigger

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22) Gain Margin is calculated at

Resonant Frequency
Gain crossover frequency
Phase crossover frequency
Half power frequency

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23) In PCM for a signal of 1V-pp represented by 8 bits have SNR in dB?

20dB
40dB
48dB
64dB

---

24) Message signal is passed through which block before PM to generate FM

Differentiater
Integrater
Multiplier
Subtractor

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25) A 6V zener diode with power dissipation of 300mw is connected across a load of 100ohms with source of 19V will have series Rs of ?

100ohms
200ohms
300ohms
500ohms

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26) Following waveform when given as input to comparator output waveform will be

Sinewave
Square wave
Ramp
Unit step

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27) Following circuit has net inductance of

6 H
10 H
7 H
1 H

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28) characteristic impedance of circuit with Zoc = 25 ohms, Zsc = 36 ohms

50 ohms
30 ohms
100 ohms
125 ohms

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29) 7 bit Flash type ADC requires how many comparators ?

128
255
512
127

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30) Given State Transition Matrix has eigen values A=

R1 [10] R2 [03]

1,3
2,2
0,4
1,4

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31) Channel Capacity of a channel having SNR=63dB and bandwidth of 5Khz

15kbps
30kbps
45kbps
60kbps

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32) Power saving in SSB when compared to AM for u=1

5/6
6/5
1.3
0.2

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33) When compared to BJT. FET has

High Input Impedance and High Gain
High Input Impedance and Low Gain
Low Input Impedance and High Gain
Low Input Impedance and Low Gain

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34) Common Emitter amplifier with out bypass capacitor act as

Current Shunt Feedback
Current Series Feedback
Voltage Shunt Feedback
Voltage Series Feedback

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35) Star equivalent of given Delta circuit has resistance in ohms

0.6, 1.5 ,1
1, 2, 3
1.5, 6, 3
1, 1.5, 9

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36) Given Phase velocity of 400M meters/sec then Group Velocity

2.5 * 10^8
2.25*10^8
3*10^8
2*10^8

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37) Race around condition occurs in

RS Flip-Flop R =0, S=0
RS Flip-Flop R=1, S=1
JK Flip-Flop J=1, K=1
JK Flip-Flop J=0, K=0

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38) Pole-Zero plot represents which compensator

Lead
Lag
Lag-Lead
Lead-Lag

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39) Which Modulation Scheme will have low Probability of error

ASK
BFSK
BPSK
MSK

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40) Modulation index of AM signal having Vmax = 4v Vmin = 2v

3
1/3
1
1/2

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41) Which MOSFET can act in dual modes based on Gate Source voltage

E-MOSFET
DE-MOSFET
N-MOSFET
P-MOSFET

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42) Which of the following is Barkhausen criteria for oscillations

|AB|=1, Phase shift =180
|AB|≠1, Phase shift = 360
|AB|=1, Phase shift = 360
|AB|≠1, Phase shift = 180

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43) In the given circuit find the current of VCCS in amps

5
3
2
1

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44) In Smith Chart a peg is moved along Constant R circle in Anti clock wise direction from Quadrant 1 to Quadrant 3 then Reactance becomes

Changes from Capacitive to Inductive
Changes from Inductive to Capacitive
Capacitive only
Inductive only

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45) Minimum number of NOR gates required to realize XOR

4
5
3
10

---

46) Type number of system whose H(s)=1/(S^4 +3S^3+S^2)

3
1
2
4

---

47) 2-stage amplifier formed with CE followed by CB is called as

Cascade
Cascode
Multiplier
Transformer Coupled

---

48) Ideal op-amp have

Infinite Input Impedance
Zero Input Impedance
Zero Voltage Gain
Infinite output Impedance

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49) E at (1,2,1) for given V= 2x^2yz

4i+2j+4k
4i+4j+2k
4i+4j-2k
-(4i+2j+4k)

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50) Dual of function x(y+z)=xy+xz

x^1 +(yz)^l=(x^1+y^1)(x^1+y^1)
x+yz=(x+y)(x+z)
xz+y=(x+z)(y+z)
xy+yz=(x+y)(y+z)

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51) output of following circuit

100 V
85 V
-85 V
-100 V

---

52) polarization of signal with Ex=5cos(wt-Bz), Ey=5sin(wt-Bz)

Linear
Elliptical
Right Circular
Left Circular

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53) Analog value of 4 bit Binary Weighted Resistor DAC for 1011 with Rf=1K ohms, R=10K ohms

-3.5 V
-5.5 V
-3.125 V
-6.125 V

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54) A Directional Coupler have Directivity of 30dB and Coupling of 40dB then Isolation should be

30 dB
40 dB
70 dB
10 dB

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55) which modelling has lowest level of abstraction in VHDL

Behavioral
Data Flow
Gate Level
Structural

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56) complementary solution of

c1e(x) +c2e(-x)
c1(e(x)+xe(x))
(c1+xc2)e(-x)
(c1+xc2)e(x)

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57) Laplace Transform of cos(at)

1/S^2 +a^2

s/s^2 +a^2
a/s^2 +a^2
sa/s^2 +a^2

---

58) Program Counter holds

Current address
Next Instruction address
Past Instruction address
Address of Accumulator

---

59) For pulse repetation frequency of 1Mhz un ambiguous range

300 m
250 m
150 m
100 m

---

60) A mismatched waveguide had a reflection coefficient of 1/3 then its VSWR

1/2
2
1
-2

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61) ∫(0,∞)δ(t)cos⁡(wt)dt =

0
1
1/2
-1

---

62) which of the following cannot be realised during logic synthesis in VerilogHDL

*
+
%
===

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63) System defined by Y(t)=tX^2(t) is

Linear and Time Invariant
Linear and Time Variant
Non-linear and Time Invariant
Non-linear and Time Variant

---

64) Which of the following devices can handle High power

Coaxial Cable
Transmission Lines
Microwave Waveguide
Optical fiber

---

65) Accumulator content at the end of code XRA A MVI B, #07 H ADD B loop: DEC A JC loop

00H
07H
06H
FFH

---

66) Magic T have

2 port Junction
3 port Junction
4 port Junction
no junction

---

67) Probability of getting 53 rd monday in a leap year

1/7
2/7
3/7
4/7

---

68) Operator which has least order of precedance in Verilog HDL

+
%
*
Conditional operator

---

69) Z-Transform of na^nu(n)

z/(z-a)
za/(z-a)^2
z^2/(z-a)^2
z/(z-a)^2

---

70) Continuous Wave Radars with out modulation can find

Range only
Doppler Shift only
both a & b
none

---

71) A Gun diode have how many junctions

2
3
4
0

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72) (Cos(wt)+iSin(wt))^n

Cis(wt+n)
Cis(wt-n)
Cis(nwt)
Cis(wt/n)

---

73) Fourier Transform's weak Dirchlet condition

Absolute Integrability
Finite Max/Min
Finite Discontinuties
all of the above

---

74) Draw back of MTI radar

can't find Range
can't find Doppler shift
both a &b
Blind Speed

---

75) Following Device/s work on the principle of Faraday's law of rotation

Circulator
Isolator
Both a & b
none

---

76) Fourier Series is defined for

Continuous and Periodic
Continuous and aperiodic
Discrete and Periodic
Discrete and Aperiodic

---

77) Minimum number of Geostationary satellites are required to cover earth

3
4
8
9

---

78) Which of the following is used as power amplifier in Satellite Communication System

TWT
Klystron
Magnetron
Gyrotron

---

79) Magnetron is a

Cross Field amplifier
Direct Field amplifier
Resonant Cavity
Bunching Cavity

---

80) GSM operates at

960Mhz
900Mhz
1000Mhz
1200Mhz

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