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Communication Systems

Communication Systems
A buffer amplifier is

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

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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

16
15
1
8

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Communication Systems
For attenuation of high frequencies we should use

Shunt capacitance
Resistance
Inductance
Series capacitance

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Communication Systems
Under ordinary circumstances, impulse noise can be reduced in

AM only
Both AM and FM
None of these
FM only

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

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

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Communication Systems
The frequency range of 300 kHz to 3000 kHz is known as

Low frequency
Very high frequency
High frequency
Medium frequency

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