ISRO Scientist or Engineer Electronics 2013

ISRO Scientist or Engineer Electronics 2013 - Question 1

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Determine the matched filter response h(t) for signal s(t) shown below:

A

B

C

D

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ISRO Scientist or Engineer Electronics 2013 - Question 2

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A signal source with 100m wavelength is connected to the input terminals of a 150m long transmission line terminated in its characteristic impedance. The phase difference between the voltages at two ends of the transmission line in steady-state condition is :

A

$$ 2 \pi $$

B

$$ 3 \pi $$

C

$$ 4 \pi $$

D

$$ \pi $$

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ISRO Scientist or Engineer Electronics 2013 - Question 3

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A charge $$Q_2 = 8.854 \times 10^{-9} C$$ is located in a vacuum at $$P_2 (2,3,1)$$. The force on $$Q_2$$ due to a charge $$ Q_1 = 4 \pi \times 10^{-3} C$$ at $$P_1 (2,2,1)$$ is: (Note: All the coordinates are measured in Meters. $$a_x, a_y$$, and $$a_z$$ are unit vectors in X, Y and Z direction respectively.)

A

$$ a_y N $$

B

$$ -a_y N $$

C

$$ 4a_x + 5a_y + 2a_z N $$

D

$$ -4a_x - 5a_y - 2a_z N $$

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ISRO Scientist or Engineer Electronics 2013 - Question 4

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A low pass filter as shown in following figure is built using an operational amplifier having unity gain bandwidth of 1MHz. What is the bandwidth of this circuit ?

A

1 KHz

B

10 KHz

C

100 KHz

D

500 KHz

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ISRO Scientist or Engineer Electronics 2013 - Question 5

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What is the frequency and duty cycle of output Y, when CLK frequency is 1 MHz @ 50% duty cycle?

A

500 KHz @ 50% duty cycle

B

500 KHz @ 25% duty cycle

C

250 KHz @ 50% duty cycle

D

250 KHz @ 25% duty cycle

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ISRO Scientist or Engineer Electronics 2013 - Question 6

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For an isotropic radiator, electric field intensity at a distance R is measured as 3 V/m. What will be the electric field intensity at a distance 3R ?

A

$$ 1 V/m $$

B

$$ \frac {1} {3} V/m $$

C

$$ \frac {1} {9} V/m $$

D

$$ 3 V/m$$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 7

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The logic function implemented by following 4 :1 MUX is

A

Z = X and Y

B

Z = X or Y

C

Z = X xor Y

D

Z = X xnor Y

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ISRO Scientist or Engineer Electronics 2013 - Question 8

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Characteristic impedance of a two-wire transmission line at 1OKHz is 200-j50 ohms. Line is terminated in its characteristic impedance, and a 28.28V p-p signal is measured at its input. Determine the real power supplied by the signal source to the line?

A

0.5 W

B

0.485 W

C

0.47 W

D

0.25 W

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ISRO Scientist or Engineer Electronics 2013 - Question 9

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Which is the correct waveform across capacitor in the following circuit?

A

B

C

D

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ISRO Scientist or Engineer Electronics 2013 - Question 10

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Input voltage applied to a circuit is 1V rms and the output is 1 mV rms. Net gain of the circuit is:

A

+30dB

B

-30dB

C

-60dB

D

+60dB

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 11

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Two ideal quantizers A and B have following specifications :
A: 5 bit Quantizer with input dynamic range of -1V to +1V with Q1 as quantization noise power
B: 8 bit Quantizer with input dynamic range of -0.5V to +0.5V with Q2 as quantization noise power.
Then Q1/Q2 will be

A

16

B

256

C

64

D

128

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 12

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The divergence of magnetic field intensity is

A

Electric charge density

B

Electric field intensity

C

Zero

D

Conduction current density

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ISRO Scientist or Engineer Electronics 2013 - Question 13

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A UART is configured to transmit 8 bit data, 1 start bit and 1 stop bit. The serial data output is observed on oscilloscope, which looks like a square wave with frequency of 9600 Hz. Whatis the baud rate and transmitted data?

A

Baud rate = 9600, Data = 55h

B

Baud rate = 19200, Data = 55h

C

Baud rate = 19200, Data = FFh

D

Baud rate = 9600, datata = AAh

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ISRO Scientist or Engineer Electronics 2013 - Question 14

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A transmission line having characteristic impedance of 50ohms has to deliver 1OKW power at 100KHz to a load. Maximum permissible value of rms current anywhere along the line is 20A. Whatis the maximum VSWR that can be tolerated on this line?

A

2

B

1

C

3

D

2.5

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 15

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Routh Hurwitz criterion is used to determine

A

Relative stability of the system

B

Time response of the system

C

Absolute stability of the system

D

Rootsof the characteristic equation graphically

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ISRO Scientist or Engineer Electronics 2013 - Question 16

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The decoding circuit shown in the figure is has been used to generate active low chip select signal of memory interfaced to 8 bit microprocessor with 16 bit address bus. What is address range and size of memory?

A

D000h to EFFFh , size = 8K Bytes

B

D000h to DFFFh, size = 4K Bytes

C

C000h to FFFFh, size = 16K Bytes

D

E000h to EFFFh, size = 4K Bytes

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 17

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If the waveguide cross-section of a square waveguide with TE11 propagation mode isgradually deformed into a circle, then the corresponding circular waveguide mode will be:

A

TE11

B

TE10

C

TE21

D

TE12

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 18

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What could be the output current rating of following shunt regulator?

A

$$ 0 < I_L < 100mA $$

B

$$ 20mA < I_L < 100mA $$

C

$$ 0 < I_L < 50mA $$

D

$$ 10mA < I_L < 100mA $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 19

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An FM-CW (Frequency Modulated - Continuous Wave) Radar is essentially

A

Bistatic

B

Monostatic

C

Can operate either as monostatic or as bistatic

D

None of the above

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 20

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The flux in a magnetic coreis sinusoidally varying at 200 Hz. The maximum flux density is 2 Tesla and eddy current loss is 15 W.If the frequency is raised to 400 Hz and maximum flux density reduced to 1 Tesla, the eddy current loss will

A

Reduce to half

B

Get doubled

C

Reduce to one-fourth

D

Remain same

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 21

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The eiectric field intensity E and magnetic field intensity H are coupled and propagating in free space in x and y direction respectively, the Poynfing vector is given by-

A

$$ EH\widehat{x} $$

B

$$ EH\widehat{y} $$

C

$$ EH \widehat{x} \widehat{y} $$

D

None of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 22

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If x and y are two random signals with zero mean Gaussian distribution having identical standard deviation, the phase angle between them is

A

Zero mean Gaussian distributed

B

Uniform between $$ -\pi and \pi $$

C

Uniform between $$ -\pi/2 and \pi/2 $$

D

Non-zero mean Gaussian distributed

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 23

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The current flowing through a capacitor in an AC circuitis :

A

Non-existent

B

Conduction current

C

Displacement current

D

None of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 24

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Which of the following is the Boolean function for Majority Voting, assuming A,B,C are inputs and Y is output?

A

Y = AB + AC + CB

B

Y = A + B + C

C

Y = ABC

D

Y = AB + BC

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 25

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For broadside antenna array,the largest possible spacing between the antenna elements without any grating lobes is

A

$$ \frac {\lambda} {2} $$

B

$$ \lambda $$

C

$$ 2 \lambda $$

D

None of the above

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 26

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For the 8085 assembly language program given below, the content of the accumulator after the execution of the program is
3000 MVI A, 45H
3002 MOV B, A
3003 STC
3004 CMC
3005 RAR
3006 XRA B

A

00H

B

45H

C

67H

D

E7H

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 27

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Conduction angle of a Class AB amplifier is:

A

$$ <180^\circ $$

B

Between $$180^\circ and 360^\circ $$

C

$$ 360^\circ $$

D

$$ 90^\circ $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 28

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For non dispersive medium

A

Phase velocity > Group velocity

B

Phase velocity < Group velocity

C

Phase velocity = Group velocity

D

Noneof the above

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 29

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Schottky clamping is resorted in TTL gates

A

to reduce propagation delay

B

to increase noise margins

C

to increase packing density

D

to increase fan-out

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ISRO Scientist or Engineer Electronics 2013 - Question 30

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At cut-off frequency, the phase velocity of a waveguideis

A

Zero

B

Infinite

C

Finite

D

None of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 31

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A Zener diode, when usedin voltage stabilization circuits, is biased in

A

reverse bias region below the breakdown voltage

B

reverse breakdown region

C

forward bias region

D

forward bias constant current mode

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ISRO Scientist or Engineer Electronics 2013 - Question 32

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The closed loop frequency response of a dc-dc converter is shown in following figure. What are the gain and phase margins?

A

$$ 20dB, 80^\circ $$

B

$$ 26dB, 80^\circ $$

C

$$ 20dB, 120^\circ $$

D

$$ 26dB, 120^\circ $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 33

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If for a silicon npn transistor, the base-to-emitter voltage (VBE) is 0.7V and the collector-to-base voltage (VCB)is 0.2 V, then the transistor is operating in the

A

normal active mode

B

saturation mode

C

inverse active mode

D

cut off mode

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 34

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3 port Circulator is

A

Reciprocal, matched

B

Non reciprocal, unmatched

C

Non reciprocal, matched

D

Reciprocal, unmatched

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ISRO Scientist or Engineer Electronics 2013 - Question 35

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An 8 bit ripple counter and an 8 bit synchronous counter are made using flip flops having a propagation delay of 10 ns each. If the worst case delay in the ripple counter and the synchronous counter be R and S respectively, then

A

R = 10ns, S = 80ns

B

R = 40ns, S = 10ns

C

R = 10ns, S = 10ns

D

R = 80ns, S = 10ns

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 36

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Gain of an RC low pass filter having a time constant $$‘\tau’$$ and frequency $$‘\omega’$$ is:

A

$$ \sqrt{1+(\omega \tau)^2} $$

B

$$ \frac {1}{\sqrt{1+(\omega \tau)^2}} $$

C

$$ \frac {\omega \tau}{\sqrt{1+(\omega \tau)^2}} $$

D

$$ \frac {\omega \tau}{\sqrt{1-(\omega \tau)^2}} $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 37

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For a directional coupler, the quantities I (isolation in dB), D (directivity in dB), C (coupling in dB) are related by

A

$$I = \frac{C}{D}$$

B

$$I = D - C$$

C

$$I = D + C$$

D

$$I = \frac{D}{C}$$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 38

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The two numbers represented in signed 2’s complement form are P = 11101101 and Q = 11100110. If Q is subtracted from P, the value obtained in signed 2’s complement is

A

1 0 0 0 0 0 1 1 1 1

B

0 0 0 0 0 1 1 1

C

1 1 1 1 1 0 0 1

D

1 1 1 1 1 1 0 0 1

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 39

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Depletion type MOSFET operates in :

A

Depletion Mode only

B

Enhancement Mode only

C

Both depletion and enhancement mode

D

None of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 40

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Electric Field and Magnetic Field are perpendicular to each other in :

A

Klystron

B

Magnetron

C

TWTA

D

All of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 41

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A linear regulator is attempted using discrete components as shown below. What is the output voltage?

A

9.3 V

B

7.5 V

C

0 V

D

2.5 V

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 42

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If range of a radar is to be doubled, the peak transmit power of the radar has to be:

A

Increased by a factor of 2

B

Increased by a factor of 4

C

Decreased by a factor of 4

D

Increased by a factor of 16

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 43

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The electric field measured in the far field of an antenna at a distance of 50m is 1V/m. The average power densities at a distance of 500m from the antenna is

A

$$ 26.6 \mu W/m^2 $$

B

$$ 0.1 \mu W/m^2 $$

C

$$ 10 \mu W/m^2 $$

D

$$ 13.3 \mu W/m^2 $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 44

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If a counter having 10 Flip Flops is initially at 0, what count will it hold after 2060 pulses ?

A

000 000 1100

B

000 001 1100

C

000 001 1000

D

000 000 1110

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ISRO Scientist or Engineer Electronics 2013 - Question 45

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For a frequency modulated signal represented by $$ s(t) = 10 \sin (6 \times 10^8 t + 2 \sin 100\pi t)$$. The maximum frequéncy deviation in the carrier from its unmodulated frequency is:

A

990 Hz

B

100 Hz

C

50 Hz

D

200 Hz

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 46

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For which of the following conditions, the circuit shown below will function as precision full. wave rectifier?

A

R1 = R2 = R

B

R1 = R3 = R

C

R2 = 2R1

D

R1 = R2 = R3

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 47

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In a monostatic radar, if the antenna aperture is doubled, then the radar range will

A

Reduce by a factor of 2

B

Increase by a factor of 2

C

Reduce by factor of $$ \sqrt 2 $$

D

Increase by a factor of $$ \sqrt 2 $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 48

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The disadvantage of single stub matching is that

A

Every load needs a new stub position

B

Only shunt stub should be used

C

Only resistive load can be matched

D

Useful only in two wire transmission line

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 49

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A certain antenna with an efficiency of 95% has maximum radiation intensity of 0.5 W/sr. The directivity of the antenna fed by input power of 0.4 W

A

16.53

B

12.2

C

10.36

D

11.31

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 50

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A memory system of size 16 K bytesis required to be designed using memory chips which have 12 address lines and 4 data lines each. Then numberof such chips required to design the memory system is

A

2

B

4

C

8

D

16

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 51

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In the asymptotic bode plot of a transfer function of a closed loop system shown below, the number of poles and zeros are,

A

3 pole, 2 zero

B

2 pole, 2 zero

C

2 pole, 1 zero

D

3 pole, 1 zero

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 52

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Plane Wave travelling in free space has an average Poynting vector of $$3W/m^2$$. Average energy density $$(nJ/m^3)$$ of the wave is:

A

10

B

5

C

1

D

3

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 53

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For two identical n-channel JFET’s connected in parallel as shown in fig. below, the pinch-off voltage of equivalent JFET is :

A

Doubled

B

Becomes half

C

Remains same

D

None of the above

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 54

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The velocity at which a sinusoidal signal of $$ 10^9 rad/s$$ travels down loss-less transmission line for which $$ L = 0.4 \mu H/m$$ and $$ C = 40 pF/m is

A

$$ 2.36 \times 10^8 m/s $$

B

$$ 2.5 \times 10^8 m/s $$

C

$$ 5 \times 10^9 m/s $$

D

$$ 4.5 \times 10^9 m/s $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 55

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The Maxwell’s equation $$ \triangledown \times \overline{E} = -\frac{\partial \overline{B}}{\partial t} $$ is obtained from:

A

Ampere’s Law

B

Faraday’s Law

C

Lenz’s Law

D

Both b and c

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 56

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A lossless line having characteristic impedance Zo is terminated with a load impedanceof jZo. VSWR of the line will be :

A

1

B

10

C

Infinite

D

None of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 57

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A signal $$ 1 + \cos (2 \pi ft) + \cos (6 \pi ft)$$ where f = 1 MHz is sampled at 3 MHz and Fourier Transform is carried out. How many lines will be seen in Fourier Transform?

A

5

B

1

C

3

D

2

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 58

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The array factor of an array antenna depends on

A

Number of radiating elements

B

Spacing between the elements

C

Phase of the applied signal

D

All of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 59

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Which of the following parameter is improved by introducing pipelining in digital design?

A

Area (Gate count)

B

Maximum clock frequency

C

Power dissipation

D

Noise

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ISRO Scientist or Engineer Electronics 2013 - Question 60

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A transmission line having characteristic impedance $$‘Z_t’$$ of varying length in series with a load impedance $$‘Z_L’$$ appears in a Smith Chart on:

A

Constant Resistance Circle

B

Constant VSWR Circle

C

Constant Reactance Circle

D

All of the above

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 61

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Impedance characteristics on a Smith Chart repeatafter a distance of:

A

$$\lambda$$

B

$$\frac {\lambda}{4}$$

C

$$ \frac{\lambda}{2}$$

D

None of the above

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ISRO Scientist or Engineer Electronics 2013 - Question 62

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If $$\tau$$ is the time constant and $$\omega$$ is the applied frequency, a low pass RC filter acts as a pure integrator when:

A

$$\omega \tau = 0$$

B

$$ \omega \tau >> 1 $$

C

$$ \omega \tau = 1 $$

D

$$ \omega \tau << 1 $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 63

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$$10 \mu F$$ capacitor is connected across secondary winding of a high frequency transformer having primary to secondary turns ratio 5:2. What is the value of capacitance seen across primary?

A

$$ 4\mu F $$

B

$$ 62.5\mu F $$

C

$$ 25\mu F $$

D

$$ 1.6\mu F $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 64

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What will be the output of the following circuit, if point-P is stuck at 1?

A

A + B + C

B

A'B'C’

C

(ABC)'

D

0

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 65

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For the current mirror circuit shown below, if the emitter area of Q2 is thrice of Q1, the current I is:

A

0.328mA

B

2.955mA

C

0.105mA

D

0.012mA

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 66

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Output of an Op-ampis 1V peak,and slew rate is $$ 5V/ \mu s$$. The maximum frequency of input sinusoidal signal that can be reproducedis:

A

398Hz

B

796Hz

C

796KHz

D

398KHz

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 67

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What is the division factor of the following clock divider circuit?

A

2

B

3

C

1.5

D

2.5

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 68

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For the circuit given below, the voltage $$ V_O$$ across the op-amp output is:

A

-9Vi

B

-3Vi

C

-11Vi

D

9Vi

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 69

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The rms value of current $$ i(t) =I_1 \sin \omega t + I_2 \sin 2\omega t $$ is:

A

$$ (I_1^2 + I_2^2)^{\frac {1}{2}} $$

B

$$ \left( \frac {I_1 ^2} {2} + \frac {I_2 ^2} {2}\right)^ \frac {1}{2} $$

C

$$ \left( \frac {I_1 ^2} {2} + {2I_2 ^2}\right)^ \frac {1}{2} $$

D

$$ \left( \frac {I_1 ^2} {2} + {4I_2 ^2}\right)^ \frac {1}{2} $$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 70

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Given the output for the following non-inverting summing amplifier, the relation between $$R_f$$ and R in the circuit is:

A

$$ R_f = R $$

B

$$ R_f = 4R $$

C

$$ R_f = 2R $$

D

$$ R_f = \frac{R}{2} $$

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ISRO Scientist or Engineer Electronics 2013 - Question 71

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A pulse signal having 100 kHz frequency and 70 nsec rise time is to be measured on an oscilloscope. The minimum required bandwidth of the oscilloscope is,

A

500 kHZ

B

14.3 MHz

C

5 MHz

D

200 kHZ

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 72

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Multiple collectors are used in Traveling Wave Tube (TWT)to:

A

To distribute the dissipated heat evenly

B

To increase the overall efficiency

C

To increase the gain of the TWT

D

To shape the electron beam

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 73

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A lossless antenna has directional gain $$ G(\theta,\psi)$$, then $$\int_{\psi = -\frac{\pi}{2}}^{\psi = \frac{\pi}{2}}$$ $$\int_{\theta = -\frac{\pi}{2}}^{\theta = \frac{\pi}{2}} G(\theta, \psi)d \theta d \psi$$ is:

A

$$4\pi$$

B

$$2\pi$$

C

$$ \leq 4\pi$$

D

$$ \leq 2\pi$$

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 74

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$$\sqrt[3]{\cos x - j \sin x}$$ is equal to

A

$$ (\cos x)^{\frac{1}{3}} - j(\sin x)^{\frac{1}{3}} $$

B

$$\sqrt[3]{\cos^2x -j\sin^2x}$$

C

$$ \cos \frac{x}{3} - j \sin \frac{x}{3}$$

D

$$ \sin \frac{x}{3} - j \cos \frac{x}{3}$$

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ISRO Scientist or Engineer Electronics 2013 - Question 75

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If f(t) is 1 MHz sinusoid with 1 Vp - p and sampling frequency fs is 25 KHz, the output will be:

A

0V

B

DC value anywhere between -1V and +1V

C

DC value anywhere between 0.5V and +0.5V

D

1Vp-p 1MHz sinusoid

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ISRO Scientist or Engineer Electronics 2013 - Question 76

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For a practical low pass filter, the ideal amplitude and phase response will be:

A

B

C

D

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ISRO Scientist or Engineer Electronics 2013 - Question 77

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A 10dB attenuator is put at the input of a low noise amplifier having 3dB noise figure. Now the noise figure of the cascaded amplifier will be.

A

3dB

B

12dB

C

7dB

D

None of the above

View Solution

ISRO Scientist or Engineer Electronics 2013 - Question 78

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A 33.33% duty cycle rectangular wave is fed to the input of an Spectrum Analyzer. What will be observed?

A

$$ 2^{nd}, 5^{th}, 8^{th} .............$$ harmonics missing

B

$$ 3^{rd}, 6^{th}, 9^{th} .............$$ harmonics missing

C

$$ 1^{st}, 4^{th}, 7^{th} .............$$ harmonics missing

D

All the harmonic present

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ISRO Scientist or Engineer Electronics 2013 - Question 79

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Phase function of a filter is $$(f) = kf^2,k > 0$$. The group delay of the filter has the shape

A

B

C

D

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ISRO Scientist or Engineer Electronics 2013 - Question 80

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1Vp-p sinusoid is digitized by a 4 bit A-to-D converter with input dynamic range of 2 Vp-p. The signal to noise ratio of the digitized signal is:

A

384

B

96

C

48

D

24

View Solution