Communication Systems - ECE Questions and Answers

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Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and odd harmonics

A fundamental sine wave and even harmonics

A fundamental sine wave and harmonics

Fundamental and subharmonic sine waves

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If sampling is done at the rate of 10 kHz. The bandwidth required is

35 kHz

70 kHz

10 kHz

1280 kHz

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

Armstrong modulator

Varactor diode modulator

Reactance FET modulator

Reactance bipolar transistor

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In practical commercial FM system, channel bandwidth is

150 kHz

100 kHz

88 MHz

108 MHz

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

Improved efficiency

Better linearity

High power output per transistor

The lower modulating power requirement

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Leak type bias is used in plate modulated class C amplifier to

Increase the bandwidth

Prevent over modulation

Prevent excessive grid current

Prevent tuned circuit damping

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FM transmitting and receiving equipment as compared to AM equipment is

Costly

Cheaper

Almost equally costly

None of the above

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For AM receivers the standard IF frequency is

106 kHz

455 kHz

1.07 MHz

10.7 MHz

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A modem is classified as low speed if data rate handled is

Upto 100 bps

Upto 250 bps

Upto 400 bps

Upto 600 bps