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Communication Systems

Communication Systems
A buffer amplifier is

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

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Communication Systems
Commercial Frequency deviation of FM is

80 kHz
75 kHz
70 kHz
65 kHz

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

Low frequency
High frequency
Very high frequency
Medium frequency

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Communication Systems
When the length of antenna is a whole wavelength

The radiation at right angles is zero
The radiation is maximum in all directions
The radiation is zero in all directions
The radiation at right angles is maximum

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Communication Systems
Which of the following is an indirect way of generating FM?

Varactor diode modulator
Reactance FET modulator
Reactance bipolar transistor
Armstrong modulator

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Communication Systems
For a low level AM system, the amplifiers modulated stage must be

Class C amplifiers
Linear devices
Harmonic devices
Non-linear devices

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