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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-4 section-2

Each section contains 100 MCQs on Communication Systems .
31
The input a coherent detector is DSB-SC signal plus noise. The noise at the detector output is
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Answer & Solution
Answer: Option A
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32
The Foster-Seeley discriminator responds to the input FM signal's
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Answer: Option B
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33
The auto-correlation function of an energy signal has
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Answer: Option D
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34
The output of a transmitter is 100 kW with carrier unmodulated and 132 kW when carrier is modulated by a sinusoidal wave. Then the depth of modulation is
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Answer: Option C
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35
Decoding, storage and interpretation are the process steps of . . . . . . . .
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Answer: Option B
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36
Match List-I with List-II and select the correct answer using the options given below:
List-I List-II
a. IF Noise 1. Ganged tunning
b. Image frequency 2. Spurious response
c. Station selector 3. Leaky filter capacitor
d. Excessive hum 4. Mixer stage
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Answer: Option D
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37
A product modulator yields
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Answer: Option B
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38
4(1 + 2cos200πt)cos400πt, for demodulation we are using which technique . . . . . . . .
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Answer: Option C
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39
A carrier voltage is simultaneously modulated by two sine waves causing modulation indices of 0.4 and 0.3. The overall modulation index is
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Answer: Option C
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40
A random variable X has $$\overline {\text{X}} $$ = 0 & $$\sigma _{\text{x}}^2$$ = 1. Form a new random variable Y = 2X + 1. The values of $$\overline {\text{Y}} $$ & $$\sigma _{\text{y}}^2$$ are:
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Answer: Option C
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