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Communication Systems

Communication Systems
Which one of the following is analog?

PCM
PWM
Differential PCM
Delta modulation

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Communication Systems
A buffer amplifier is

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

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Communication Systems
For AM receivers the standard IF frequency is

455 kHz
1.07 MHz
10.7 MHz
106 kHz

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Communication Systems
Skip distance depends on time of day and angle of incidence.

True
False

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Communication Systems
For telegraphy the most commonly used modulation system is

PCM
Single tone modulation
Two tone modulation
FSK

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Communication Systems
To eliminate ghosts in the picture

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

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