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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-5 section-2

Each section contains 100 MCQs on Communication Systems .
41
A Frequency Hopping Spread Spectrum system has its frequency synthesizers controlled by five stage shift-registers with feedback connections taken from the second and fifth stages. The number of slots available for frequency hopping is
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Answer & Solution
Answer: Option A
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42
Consider a WSS random process X(t), whose amplitudes are normally distributed with E(x(t)) = 0 and Rx(τ) = e-2[τ]. Then P(X(t)) ≤ 2) = ?
$$\left( {Q\left( \alpha \right) = \frac{1}{{\sqrt {2\pi } }}\int\limits_\alpha ^\infty {{e^{ - \frac{{{x^2}}}{2}}}} dx} \right)$$
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Answer & Solution
Answer: Option B
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43
If fc is the carrier wave frequency and fm is the modulation frequency, then in the resulting amplitude modulated waveform the upperside band consists of:
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Answer & Solution
Answer: Option C
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44
For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma = 1) is:
(Given fm = 15 KHz & frequency deviation = ±75 KHz)
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Answer & Solution
Answer: Option A
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45
The surface wave eventually disappears as one moves away from the transmitter because of
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Answer: Option A
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46
Which of the following is not true?
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Answer & Solution
Answer: Option B
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47
The amount of frequency deviation in FM signal depends on
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Answer & Solution
Answer: Option A
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48
The primary colour used in colour television is-
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Answer & Solution
Answer: Option C
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49
A 1 mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through a cable that has 40 dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is
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Answer & Solution
Answer: Option A
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50
Which of the following is not a digital-to-analog conversion?
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Answer & Solution
Answer: Option E
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