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Communication Systems

Communication Systems
For telegraphy the most commonly used modulation system is

FSK
PCM
Single tone modulation
Two tone modulation

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Communication Systems
Which of the following is used to generate PDM?

Schmitt trigger
Monostable multi-vibrator
JK flip-flop
Free running multi-vibrator

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Communication Systems
A telephone channel requires a bandwidth of about

50 kHz
1 kHz
3 kHz
10 kHz

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Communication Systems
An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

80.9
113
102.3
70.2

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Communication Systems
Fourier analysis indicate that a square wave can be represented as

Fundamental and subharmonic sine waves
A fundamental sine wave and odd harmonics
A fundamental sine wave and harmonics
A fundamental sine wave and even harmonics

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

High frequency
Low frequency
Very high frequency
Medium frequency

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