Analog Communication System MCQs
Practice free Analog Communication System multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 280 questions — no login required.
Question 271easy
A device with input x(t) and output y(t) is characterized by : y(t)= x2(t).An FM signal with frequency deviation of 90 kHz modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
Question 272easy
A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single input 1 1 2 3 tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is
Question 273easy
Let x(t) 4---3 X (j CD) be Fourier Transform pair. The Fourier Transform of the signal x(5t - 3) in terms of X (jal) is given as j3co
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Question 275easy
A signal m(t) with bandwidth 500 Hz is first multiplied by a signal g(t) where g(t)=(--1)k 8(t -0.5 x 10-4 k) The resulting signal is then passed through an ideal lowpass filter with bandwidth 1 kHz. The output of the lowpass filter would be
Question 276easy
The minimum step-size required for a Delta-Modulator operating at 32 K samples/sec to track the signal (here u(t) is the unit-step function) x(t) = 125 t(u(t)- u(t - 1)) + (250- 125t) u(t -1)- u(t -2)) so that slope-overload is avoided, would be
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Question 277easy
The diagonal clipping in Amplitude Demodulation (using envelope detector) can be avoided if RC time-constant of the envelope detector satisfies the following condition, (here W is message bandwidth and opc is carrier frequency both in rad/sec)
Question 278easy
Leg g(t) = p(t)*p(t), where * denotes convolution and p(t) = u(t)- u(t -1) with u(t) being the unit step functionL The impulse response of filter matched to the signal s(t) = g(t) - SO - 2)* g(t) is given as
Question 279easy
An Amplitude Modulated signal is given asxAm (t) = 100 (p (t) + 0.5 g (t)) cos co t in the interval 0 t I. One set of possible values of the modulating signal and modulation index would be