Communication Systems MCQ Questions & Answers

Communication Systems MCQ Questions & Answers | ECE

Learn Communication Systems MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Communication Systems MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-2 section-3

The following cannot be used to remove the unwanted sideband in the SSB:

A) A filter system B) Balanced modulator C) Phase shift method D) Weaver's method

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Answer & Solution

Answer: Option B

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Heterodyne principle is used in

A) Transmitter B) Receiver C) Oscillator D) Power amplifier

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Answer & Solution

Answer: Option B

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What is the modulation index of an FM signal having a carrier swing of 100 kHz and modulating frequency of 8 kHz?

A) 4.75 B) 5.50 C) 6.25 D) 7.50

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Answer: Option C

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An AM signal has a total power of 48 Watts with 45% modulation. The power in the carrier and the sidebands are

A) 39.59 W, 4.505 W B) 40.59 W, 4.205 W C) 43.59 W, 2.205 W D) 31.59 W, 8.205 W

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Answer & Solution

Answer: Option C

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The RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB. For overall noise figure of the cascaded system, the correct statement is:

A) A as first stage & B as second stage offers minimum over all NF B) B as first stage & A as second stage minimum over all NF C) Both the combination will offer same overall NF D) Over all NF will be less than 3 dB

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Answer & Solution

Answer: Option B

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For a symmetrical distribution the coefficient of skewness is

A) +1 B) -1 C) +3 D) zero

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Answer & Solution

Answer: Option D

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A carrier of 10 kW is amplitude modulated to a depth of 100% by a sinusoid. Then the power of the transmitted AM wave is

A) 10 kW B) 5 kW C) 15 kW D) 11 kW

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Answer: Option C

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Select correct answer-
A 400 W carrier is modulated to a depth of 75%. Calculate the total power in the modulated wave.

A) 510 W B) 512 W C) 512.5 W D) 500 W

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Answer & Solution

Answer: Option C

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The figure shows the block diagram of a frequency discriminator. What does the second block represent?
Communication Systems mcq question image

Communication Systems mcq question image

A) Envelope detector B) Low-pass filter C) Ratio detector D) Band-reject filter

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Answer & Solution

Answer: Option A

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Percentage modulation of an AM wave having a power content of 8 kW at carrier frequency and 2 kW in each of its side bands is

A) 60% B) 70% C) 100% D) 80%

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Answer: Option C

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