# 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

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

Question 3

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

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

Question 4

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

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

Question 5

For 100% modulation, total power is ________

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

Question 6

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

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

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

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

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

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

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

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