Digital Communication System MCQs
Practice free Digital 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 252 questions — no login required.
Question 226easy
Which one of the following pulses has the same form in time domain as well as in frequency domain?
Question 227easy
the probability of density function of the envelope of a sinusoidal signal along with narrow band noise follows the following distribution :
Question 228easy
The Instrument Landing System (uS) and the Ground Controlled Approach (GCA) system of landing, use
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Question 229easy
In a PCM system, if the code word longth is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor
Question 230easy
In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t1
Question 231easy
A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an ideal low-pass filter with cut-off frequency 800 Hz. The output signal has the frequency (a) zero Hz
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Question 232easy
The free space transmission loss depends on I. Height of Satellite 2. Downlink frequency 3. Gain of transmitting antenna 4. Gain of receiving antenna
Question 233easy
Consider a binary digital communication system with equally likely O's and I's. When binary 0 is transmitted the voltage at the detector input can lie between the levels ? 0.25 V and + 0.25 V with equal probability : when binary 1 is transmitted, the voltage at the detector can have any value between 0 and 1 V with equal probability. If the detector has a threshold of 2.0 V (i.e., if the received signal is greater than 0.2 V, the bit is taken as 1), the average bit error probability is
Question 234easy
Choose the correct one from among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2. 1 : FM-P : Slope overload,2: DM-Q:,3 : PSK-R: Envelope detector,4: PCM-S : Capture effect,1: Hilbert transform U : Matched filter