Modulation and Demodulation

This is an MCQ-based quiz on Modulation and Demodulation.

This includes Transmitter, Radio receiver, RC phase-shift, and Wien-bridge,

Start Quiz

In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because ___________

The difference frequency is closer to oscillator frequency Lower frequencies are easier to amplify Only the difference frequency can be modulated None of the above

Demodulation is done in ___________

Receiving antenna Transmitter Radio receiver Transmitting antenna

Superhertodyne principle refers to

Using a large number of amplifier stages Using a push-pull circuit Obtaining lower fixed intermediate frequency None of the above

Identify the type of modulation where the modulating wave is superimposed on a high-frequency carrier wave.

Phase modulation Amplitude modulation Frequency modulation Wavelength modulation

Suggest a possible communication channel for the transmission of a message signal that has a bandwidth of 200kHz.

TV transmission Optical fiber AM radio FM radio

How can the noise be reduced in AM signal?

Increasing amplitude Increasing wavelength Increasing bandwidth Increasing frequency deviation

A carrier of peak voltage 15 V is used to transmit a message signal. If the modulation index is 70%, then what will be the peak voltage of the modulating signal?

25 V 11 V 10.5 V 30 V

What does AGC stand for?

Automatic gain control Automatic gear control Amplitude gain control Automotive gear center

Modulation is done in …………..

Transmitter Radio receiver Between transmitter and radio receiver None of the above

In a transmitter ……………. oscillator is used

Hartley RC phase-shift Wien-bridge Crystal

In an AM wave useful power is carrier by ………….

Carrier Sidebands Both sidebands and carrier None of the above

In amplitude modulation, bandwidth is ……………. the audio signal frequency

Thrice Four times Twice None of the above

Quiz/Test Summary