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Digital Communication System MCQs

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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 1easy

In a PCM system, the quantisation noise depends upon.

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Question 2easy

A pulse train has a pulse-repetition frequency of 25,000 pulses per second and pulses have a duration of 4 ps. The mark-to-phase ratio is

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Question 3easy

If in a radio receiver, RF signal has a frequency of 800 kHz and local oscillator that of 1000 kHz, then at the output of the mixer, the frequencies found would be kHz.

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Question 4easy

The coupling used in Stoneman transmission bridge is

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Question 5easy

One can provide two or more voice circuit on the same carrier by using

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Question 6easy

Complete the undergiven matching panel by utilizing the table listing numbered frequencies and lettered frequency bands. Frequencies-Frequency band,1.200 MHz-A. VLF,2. 20 kHz-B. MF,3. 10 MHz-C. VHF,4. 500 kHz-D. SHF,5. 500 MHz-E. HF,6. 20 GHz-F. UHF

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Question 7easy

Which of the following statement is not correct? Interference between two or more transmitted signals can be avoided by

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Question 8easy

Regarding two-way communication operation called duplex working, which statement is wrong?

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Question 9easy

The signal-to-quantisation noise ratio in a PCM system depends upon

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