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ESE EC : Communications Champion Quiz 2

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Question 1

Which one of the following is an indirect way of generation FM?

Question 2

FM broadcast standards specify a maximum deviation of frequency to be equal to 75 kHz and a maximum modulation frequency of 15 kHz. What is the modulation index for FM wave?

Question 3

In FDM systems used for telephone, which modulation scheme is adopted?

Question 4

Which one of the following blocks is not common in both AM and FM receivers?

Question 5

A composite signal XC(t) is expressed as: 
XC(t) = Accosωct - Amcos(ωc - ωm)t + Amcos(ωcm)t 
Which of the following methods can be employed to retrieve the sinusoidal component at ωm from Xc?

Question 6

A single tone 4 kHz message single is sampled with 10 kHz and 6 kHz. Aliasing effect will be seen in the reconstructed signal when the signal is sampled with.

Question 7

The power contained in single sideband in amplitude modulation is

Question 8

Amplitude modulation is used by broadcasting because

Question 9

IF a 400 Walt carrier is amplitude modulated to a depth of 75 percent, what is the total power in the modulated wave?

Question 10

An AM signal with a carrier of 1 kW has 200 W in each side band. The percentage of modulation is.
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Feb 26ESE & GATE EC