Test: Communication Systems - 5 - Electronics and Communication Engineering (ECE) MCQ
25 Questions MCQ Test - Test: Communication Systems - 5
A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is
When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power
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In audio cassettes the width of each recording track is
The most commonly used transistor amplifier circuit is
When energy is fed into open wire transmission line the energy may get dissipated due to
Fourier series expansion of a real periodic signal with fundamental frequency is given by 
It is given that c3 = 3 + j5. then c-3 is
3 - i5.If transmitted power is 75 kW, the field strength at 30 km distance will be about
.In the television system in India, each frame is scanned
Each kilometer of travel in electromagnetic radiation means a time delay of
A video monitor is exactly similar to TV receiver.
In single tone AM modulation, the transmission efficiency for m = 1 is
AM amplifier having noise figure of 20 dB and available power gain of 15 dB is followed by a mixer circuit having noise figure of 9 dB. The overall noise figure as referred to input in dB is
.If the oscillator output is modulated by audio frequencies upto 10 kHz, the frequency range occupied by the side bands will be
fm.Which one of the following is non-resonant antenna?
The efficiency of using a binary system for selection of 1 out of 13 equally probable events is
.The most suitable method for detecting a modulated signal g(t) = (3 to 6 cos 2pfmt) cos 2pfct is
The time required for horizontal blanking is 16% of that for each horizontal line. If horizontal time is 63.5 μs, the horizontal blanking time for each line is about
.A message signal with bandwidth 10 kHz is lower sideband SSB modulated with carrier frequency fc1 = 106 Hz. The resulting signal is then passed though a narrow band frequency modulator with carrier frequency fc2 = 109 Hz. The bandwidth of the output would be
BW ≈ 2fm 
2fc1 
2 x 106 Hz.When the number of quantising levels is 16 in PCM, the number of pulses in a code group will be
n = 4.In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor.
16.For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will
(SNE)Q + 12 dB.Top Courses for Electronics and Communication Engineering (ECE)
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