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Communication Systems

Communication Systems
Which one of the following is analog?

Differential PCM
Delta modulation
PCM
PWM

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Communication Systems
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

3E
6E
2E
4E

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Communication Systems
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

The lower modulating power requirement
Improved efficiency
Better linearity
High power output per transistor

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Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

100 ohm
500 ohm
300 ohm
1000 ohm

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Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Non-linear devices
Harmonic devices
Linear devices
Class C amplifiers

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Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

8
1
15
16

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