# AM Waves Power Relations MCQ Questions & Answers

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

Question 1

An AM signal is represented by x(t) = (30 + 2Sin(700?t)) Cos(2?t x 102t)V. Carrier power of the wave is?

A. 555W
B. 675W
C. 450W
D. 310W

Question 2

An AM signal is represented by x(t) = (30 + 2Sin(700?t)) Cos(2?t x 102t)V. Find the total power of amplitude modulated wave?

A. 453W
B. 675W
C. 789W
D. 451W

Question 3

An AM signal is represented by x(t) = (30 + 2Sin(700?t)) Cos(2?t x 102t)V. What is the value of modulation index?

A. 0.7
B. 0.066
C. 0.341
D. 0.916

Question 4

Calculate power in each sideband, if power of carrier wave is 176W and there is 60% modulation in amplitude modulated signal?

A. 13.36W
B. 52W
C. 67W
D. 15.84W

Question 5

For 100% modulation, power in each sideband is ________ of that of carrier.

A. 50%
B. 70%
C. 60%
D. 25%

Question 6

For 100% modulation, total power is?

A. same as the power of unmodulated signal
B. twice as the power of unmodulated signal
C. four times as the power of unmodulated signal
D. one and half times as the power of unmodulated signal

Question 7

For getting 100% modulation, carrier amplitude should ________

A. exceed signal amplitude
B. be equal to signal amplitude
C. be lesser than signal amplitude
D. be equal to 0

Question 8

Noise performance of a square law demodulator of AM signal is?

A. Better than that of synchronous detector
B. Weaker than that of synchronous detector
C. Better than that of envelope detector
D. Weaker than that of envelope detector

Question 9

Overmodulation results in ________________

A. Distortion
B. Weakens signal
C. Strengthens the signal
D. provides immunity to noise

Question 10

The maximum power efficiency of an AM modulator is?

A. 25%
B. 33%
C. 66%
D. 100%

Question 11

An AM signal is represented by x(t) = (30 + 2Sin(700πt)) Cos(2πt x 102t)V. Carrier power of the wave is?

A. 555W
B. 675W
C. 450W
D. 310W

Question 12

An AM signal is represented by x(t) = (30 + 2Sin(700πt)) Cos(2πt x 102t)V. Find the total power of amplitude modulated wave?

A. 453W
B. 675W
C. 789W
D. 451W