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Communication Systems

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

1
2
-3
3

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Communication Systems
In practical commercial FM system, channel bandwidth is

150 kHz
108 MHz
100 kHz
88 MHz

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Communication Systems
To eliminate ghosts in the picture

Connect a booster
Use a longer transmission line
Change the antenna orientation of location
Twist the transmission line

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Communication Systems
Which one of the following is analog?

Delta modulation
Differential PCM
PCM
PWM

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Communication Systems
A woofer should be fed from the input through a

Band pass filter
Low pass filter
Band stop filter
High pass filter

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Communication Systems
In TV systems, equalising pulses are sent during

Horizontal blanking
Horizontal retrace
Vertical blanking
Serrations

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