Communication Systems MCQ Questions & Answers

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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-7 section-2

Each section contains 100 MCQs on Communication Systems .

The bandwidth of the spectrum over which the hopping occurs is called

A) Total hopping bandwidth B) Instantaneous bandwidth C) Both A and B D) None of the above

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

AM signal represented as

A) S_AM(t) = A_c[1 + m(t)]cos(2πf_ct) B) S_AM(t) = A_c[1 + m(t)]sin(2πf_ct) C) S_AM(t) = A_c[m(t)]cos(2πf_ct) D) S_AM(t) = A_c[m(t)]sin(2πf_ct)

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

An FM wave is represented by y(t) = 10sin[2000πt + 4sin1250πt]. The maximum frequency deviation is:

A) 1250 Hz B) 2000 Hz C) 2500 Hz D) 4000 Hz

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The amplitude modulated wave form s(t) = A_C[1 + K_am(t)]cosω_Ct is used an ideal envelope detector. The maximum magnitude of K_am(t) is greater than 1. Which of the following could be the detector output?

A) A_Cm(t) B) [$${\text{A}}_{\text{C}}^2$$ [1 + K_am(t)]² C) [A_C|1 + K_am(t)|] D) A_C|1 + K_am(t)|²

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In an amplitude modulated system if the total power is 600 W and the power in the carrier is 400 W, the modulation index is

A) 0.5 B) 0.75 C) 0.9 D) 1

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

An AM broadcast station operates at its maximum allowed total of 100 kW with 90% modulation. The power in the intelligence part is

A) 28.8 kW B) 71.2 kW C) 35.6 kW D) 36.5 kW

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

A signal m(t) = 10cos 2π100t is frequency modulated. The resulting FM signal is x(t) = 20cos{2π10⁶t + 15sin(2π100t)}. The FM bandwidth is nearly

A) 3.2 kHz B) 9.6 kHz C) 32 kHz D) 100 kHz

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

A frequency modulated signal can be demodulated by-

A) passing through an integrator followed by envelop detection B) Multiplying with carrier frequency followed by low pass filtering C) passing through a differentiator followed by envelop detection D) passing through a voltage controller oscillator (VCO)

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Which of the following is NOT the advantage of frequency modulation?

A) Less interference and noise B) More convenient receiver and transmitter C) Power consumption is less as compared to AM D) Adjacent FM channels are separated by guard bands

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Noise figure of an amplifier depends on

A) Bandwidth B) Output power C) Power input D) None of the above

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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Communication Systems MCQ Questions & Answers | ECE