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ESE EC 2018 Achiever Study Plan: Communication Systems Quiz 1

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Question 1

What is the power contained in SSB transmission when the carrier power is 1 kW and the modulation index is 0.3?

Question 2

When a radio receiver is tuned to 555 kHz, its local oscillator provides the mixer with an input at 1010 kHz. At the output, another signal is also received along with the desired signal. What is the frequency of the other station?
What is the frequency of the other station?

Question 3

Match List-|(Modulation) with List-|| (Application) and select the correct answer using the code given below the list:
List-|
A. Wide band FM
B. Narrow band FM
C. AM
D. VSM-AM
List-||
i. Mobile communication
ii. Superimposition of binary waveform on carrier
iii. TV video
iv. TV audio
v. Medium wave broadcast
Codes:
A B C D

Question 4

Which one of the following pulse communications systems is digital?

Question 5

If ACF denotes the autocorrelation function and PSD denotes the power spectral density, then for while noise, ACF is

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ESE & GATE EC Communications

Feb 14ESE & GATE EC