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Power Calculation MCQ Questions & Answers

Power Calculation MCQs : This section focuses on the "Power Calculation". These Multiple Choice Questions (MCQs) should be practiced to improve the Power Calculation skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

24 channels, each band limited to 3.4 KHz, are to be time division multiplexed. Find the bandwidth required for 128 quantization level? (Given that sampling frequency is 8 KHz)

A. 2436 KHz
B. 1002 KHz
C. 1536 KHz
D. 1337 KHz

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Question 2

Calculate power in each sideband, if power of carrier wave is 96W and there is 40% modulation in amplitude modulated signal?

A. 11.84W
B. 6.84W
C. 3.84W
D. 15.84W

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Question 3

Find the number of pulses, if the number of level is 128 in PCM?

A. 3
B. 6
C. 4
D. 7

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Question 4

Find the power saving for DSB-SC wave with 100% modulation?

A. 66%
B. 86%
C. 50%
D. 33%

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Question 5

For 100% modulation, total power is ________

A. 1.5Pc
B. 2Pc
C. 3.75Pc
D. 1.25Pc

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Question 6

For 50% modulation, power in each sideband is ________ of that of carrier.

A. 10%
B. 4.32%
C. 5%
D. 6.25%

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Question 7

If a wave is modulated by two waves. One of them has modulation index equal to 0.75 and other has 0.2, the total modulation index will be ________

A. 0.67
B. 0.58
C. 0.77
D. 0.35

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Question 8

If each element of signal occupies 70ms, what will its speed?

A. 11.23 bauds
B. 14.28 bauds
C. 17.39 bauds
D. 13.33 bauds

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Question 9

If peak voltage of a carrier wave is 10V, what is the peak voltage of modulating signal if modulation index is 50%?

A. 10V
B. 20V
C. 8V
D. 5V

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Question 10

If power transmitted is 45kW, field at a distance of 23km will be ________

A. 0.02
B. 0.75
C. 0.05
D. 0.03

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Question 11

Maximum Amplitude of an amplitude modulated 10V and minimum amplitude is 5V. Find its modulation index?

A. 0.65
B. 0.9
C. 0.33
D. 1

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Question 12

Power of carrier wave is 300W and modulation index is 0.75. Find its total power?

A. 465W
B. 384W
C. 323W
D. 502W

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Question 13

Sampling frequency of a signal is 6 KHz and is quantized using 7 bit quantizer. Find its bit rate?

A. 48kbPs
B. 64kbPs
C. 16kbPs
D. 8kbPs

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