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Communication Systems

Communication Systems
A buffer amplifier is

A double-tuned amplifier
A high gain D.C. amplifier
A cathode follower stage
None of these

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Prevent excessive grid current
Increase the bandwidth
Prevent over modulation
Prevent tuned circuit damping

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Communication Systems
The main function of a balanced modulator is to

Suppress carrier signal in order to create a single-sideband or double sideband
Produce 100% modulation
Limit noise picked by a receiver
Produce balanced modulation of a carrier wave

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Communication Systems
SSB can be generated by

Good attenuation characteristics
Filter method
Phase cancellation method
All of these

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Communication Systems
An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

102.3
70.2
113
80.9

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Communication Systems
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Remains unchanged
Gets increased by 50 percent
Gets halved
Gets doubled

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