Communication Systems - ECE Questions and Answers

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In a TV receiver the video IF amplifier provides a gain of about

5 dB

20 dB

60 dB

200 dB

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Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?

VSB

DSB-SC

SSB

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Switching systems

are limited to small data networks

require additional lines

are not used in data system

improve the efficiency of data transfer

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Which one of the following statements is wrong. The radar cross-section of a target?

depends on frequency

may be reduced by special coating of non-spherical target

depends on the aspect of target if it is non-spherical

is equal to actual cross-sectional area for small targets

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Which of the following cannot be used to demodulate SSB?

Complete phase shift generator

Product detector

Diode balanced modulator

Bipolar transistor balanced modulator

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The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.

0.4

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Noise figure is defined as

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The inductance of connecting leads can be a source of

low frequency parasitics

high frequency parasitics

carrier frequency parasitics

none of the above

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For F₂ layer the critical frequency is about

500 MHz

100 MHz

25 MHz

10 MHz