Test: Communication-1

Question 1

In a 100% modulated signal, If the total transmitted power is P, then carrier power will be

Accepted Answer

Answer

Answer

Answer

Question 2

For an AM wave having a power of 800 W to its carrier freqency and modulation index of 90%,the power cantent of each side bond is

Accepted Answer

162 W

Answer

81 W

Answer

200 W

Answer

400 W

Question 3

For coherent detection of digital signals, the receiver must be synchronised in

Accepted Answer

time and phase

Answer

time only

Answer

phase only

Answer

None

Question 4

Quadrature multiplexing uses

Accepted Answer

Neither TDM nor FDM

Answer

TDM

Answer

FDM

Answer

Both a and b

Question 5

Accepted Answer

d

Answer

a

Answer

b

Answer

c

Question 6

Saving in power in DSB-SC system modulated at 80% is (in comparison with AM)

Accepted Answer

75.76%

Answer

zero

Answer

80%

Answer

50%

Question 7

An amplifier has a power gain of 200. What is its gain in dB (log 10² = 0.3)

Accepted Answer

23 dB

Answer

14 dB

Answer

17 dB

Answer

20 dB

Question 8

A DSB-SC signal is generated using the carrier cos (wct ) and modulating signal x(t). The envelope of DSB -SC signal is

Accepted Answer

|x(t)|

Answer

x (t)

Answer

&ndash; x(t)

Answer

x (t) <img src="https://cn.edurev.in/ApplicationImages/Temp/59_d420cbe9-59d6-44e2-940a-be0d75af75b5_lg.PNG" />

Question 9

The waveform A cos (w₁t + k cos w₂t) is

Accepted Answer

both b and c

Answer

amplitude modulated

Answer

frequency modulated

Answer

phase modulated

Question 10

The typical squelch circuit

Accepted Answer

cuts off an audio ampr when carrier is absant.

Answer

eliminates RF interference when signal is weak.

Answer

cut off an IF ampr when AGC is maximum.

Answer

Cut off an IF ampr when AGC is minimum

Question 11

In FM radio broadcasting system, the maximum frequency deviation is usually

Accepted Answer

75 kHz

Answer

15 kHz

Answer

200 kHz

Answer

5.2 kHz

Question 12

An FM signal with modulation index mf is passed through a frequency tripler, the modulation index of output signal will be

Accepted Answer

3 mf

Answer

mf

Answer

9 mf

Answer

27 mf.

Question 13

An angle modulated signal is expressed by Fa(t)= cos (2 × 10⁸ t + 75 sin 2 × 10³ t). The peak frequency deviation of carrier is the

Accepted Answer

75 kHz

Answer

1 kHz

Answer

7.5 kHz

Answer

100 kHz

Question 14

If we add the amplitude modulated signal and narrow band FM signal with same modulation index, than resultant signal will be

Accepted Answer

SSB-FC

Answer

SSB-SC

Answer

DSB-SC

Answer

WBFM

Question 15

Which of the following modulation are used for telecasting TV programme

1. AM

2. FM

3. Pulse modulation

4. Phase modulation

Accepted Answer

1 and 2

Answer

3 and 4

Answer

2 and 3

Answer

1 and 4

Question 16

Band width requirement for commercial FM radio broad cast is

Accepted Answer

15 kHz

Answer

100 kHz

Answer

200 kHz

Answer

20 kHz

Question 17

In PCM system if the quantisation level are increased from 2 to 8, the relative bandwidth will be

Accepted Answer

four times

Answer

same

Answer

doubled

Answer

tripled

Question 18

The signal to quantisation noise ratio in an n-bit PCM system

Accepted Answer

Increase with increasing value of n.

Answer

depends upon the sampling frequency employed

Answer

is independent of the valve of n.

Answer

decreases with increasing value of n.

Question 19

In a delta modulation scheme, the step height is 75 mV and step size is 1.5 ms. The maximum slope that the staircase can track is

Accepted Answer

50 V/s

Answer

55 V/s

Answer

60 V/s

Answer

65 V/s

Question 20

Quantisation noise occurs in

Accepted Answer

PCM

Answer

PAM

Answer

PWM

Answer

PPM

Question 21

In case a signal band limited to fm is sampled at a rate less than 2fm, the constructed signal will be

Accepted Answer

distorted

Answer

distortion less

Answer

small in amplitude

Answer

having higher frequency supressed

Question 22

In PCM if transmission path is very long

Accepted Answer

Repeater stations are used

Answer

pulse width may be increased

Answer

pulse amplitude is increased

Answer

pulse spacing is reduced

Question 23

In a delta modulation system, granular noise occurs when the

Accepted Answer

modulating signal remains constant

Answer

modulating signal increases rapidly

Answer

pulse rate decreases

Answer

pulse amplitude decreases

Question 24

Compander is used for

Accepted Answer

PCM

Answer

AM

Answer

FM

Answer

DSB-SC

Question 25

For 10 bit PCM system, the signal to quantiration noise ratio is 62 dB. If the number of bits are increased by 2, then signal to noise ratio will

Accepted Answer

Increase by 12 dB

Answer

Increase by 6 dB

Answer

decrease by 6 dB

Answer

decrease by 12 dB

Communication-1 - Free MCQ Practice Test with solutions, GATE EE Basic

MCQ Practice Test & Solutions: Test: Communication-1 (25 Questions)

In a 100% modulated signal, If the total transmitted power is P, then carrier power will be

For an AM wave having a power of 800 W to its carrier freqency and modulation index of 90%,the power cantent of each side bond is

For coherent detection of digital signals, the receiver must be synchronised in

Quadrature multiplexing uses

Saving in power in DSB-SC system modulated at 80% is (in comparison with AM)

An amplifier has a power gain of 200. What is its gain in dB (log 10² = 0.3)

A DSB-SC signal is generated using the carrier cos (wct ) and modulating signal x(t). The envelope of DSB -SC signal is

The waveform A cos (w₁t + k cos w₂t) is

The typical squelch circuit

In FM radio broadcasting system, the maximum frequency deviation is usually

An FM signal with modulation index mf is passed through a frequency tripler, the modulation index of output signal will be

An angle modulated signal is expressed by Fa(t)= cos (2 × 10⁸ t + 75 sin 2 × 10³ t). The peak frequency deviation of carrier is the

If we add the amplitude modulated signal and narrow band FM signal with same modulation index, than resultant signal will be

Which of the following modulation are used for telecasting TV programme
1. AM
2. FM
3. Pulse modulation
4. Phase modulation

Band width requirement for commercial FM radio broad cast is

In PCM system if the quantisation level are increased from 2 to 8, the relative bandwidth will be

The signal to quantisation noise ratio in an n-bit PCM system

In a delta modulation scheme, the step height is 75 mV and step size is 1.5 ms. The maximum slope that the staircase can track is

Quantisation noise occurs in

In case a signal band limited to fm is sampled at a rate less than 2fm, the constructed signal will be

In PCM if transmission path is very long

In a delta modulation system, granular noise occurs when the

Compander is used for

For 10 bit PCM system, the signal to quantiration noise ratio is 62 dB. If the number of bits are increased by 2, then signal to noise ratio will

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Communication-1 - Free MCQ Practice Test with solutions, GATE EE Basic

MCQ Practice Test & Solutions: Test: Communication-1 (25 Questions)

In a 100% modulated signal, If the total transmitted power is P, then carrier power will be

For an AM wave having a power of 800 W to its carrier freqency and modulation index of 90%,the power cantent of each side bond is

For coherent detection of digital signals, the receiver must be synchronised in

Quadrature multiplexing uses

Saving in power in DSB-SC system modulated at 80% is (in comparison with AM)

An amplifier has a power gain of 200. What is its gain in dB (log 102 = 0.3)

A DSB-SC signal is generated using the carrier cos (wct ) and modulating signal x(t). The envelope of DSB -SC signal is

The waveform A cos (w1t + k cos w2t) is

The typical squelch circuit

In FM radio broadcasting system, the maximum frequency deviation is usually

An FM signal with modulation index mf is passed through a frequency tripler, the modulation index of output signal will be

An angle modulated signal is expressed by Fa(t)= cos (2 × 108 t + 75 sin 2 × 103 t). The peak frequency deviation of carrier is the

If we add the amplitude modulated signal and narrow band FM signal with same modulation index, than resultant signal will be

Which of the following modulation are used for telecasting TV programme1. AM2. FM3. Pulse modulation4. Phase modulation

Band width requirement for commercial FM radio broad cast is

In PCM system if the quantisation level are increased from 2 to 8, the relative bandwidth will be

The signal to quantisation noise ratio in an n-bit PCM system

In a delta modulation scheme, the step height is 75 mV and step size is 1.5 ms. The maximum slope that the staircase can track is

Quantisation noise occurs in

In case a signal band limited to fm is sampled at a rate less than 2fm, the constructed signal will be

In PCM if transmission path is very long

In a delta modulation system, granular noise occurs when the

Compander is used for

For 10 bit PCM system, the signal to quantiration noise ratio is 62 dB. If the number of bits are increased by 2, then signal to noise ratio will

Basic Electronics Engineering JE (Technical)

Basic Electronics Engineering JE (Technical)

Top Courses for Electrical Engineering (EE)

About this Electrical Engineering (EE) Practice Test

Explore more Electrical Engineering (EE) Study Resources

An amplifier has a power gain of 200. What is its gain in dB (log 10² = 0.3)

The waveform A cos (w₁t + k cos w₂t) is

An angle modulated signal is expressed by Fa(t)= cos (2 × 10⁸ t + 75 sin 2 × 10³ t). The peak frequency deviation of carrier is the

Which of the following modulation are used for telecasting TV programme
1. AM
2. FM
3. Pulse modulation
4. Phase modulation