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Communication Systems

Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

2
3
1
-3

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

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

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Communication Systems
For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

0.8
1
0.5

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Communication Systems
Commercial Frequency deviation of FM is

75 kHz
70 kHz
65 kHz
80 kHz

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Communication Systems
The main function of a balanced modulator is to

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

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

Gets halved
Gets increased by 50 percent
Gets doubled
Remains unchanged

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