Communication Systems - ECE Questions and Answers

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The effective length of antenna is different from actual length due to

top loading

end effects

both (a) and (b)

none of the above

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In a TV receiver there is no raster, no picture and no sound. The most likely defective stage is

power supply unit

video output circuit

horizontal oscillator

balun

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Noise can be measured by

D.C. voltmeter

A.C. voltmeter

either of the above

none of the above

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A 100 + j 100 Ω load is to be matched to a line with Z₀ = 300 Ω to give SWR = 1. The reactance of stub is

j 200 Ω

-j 200 Ω

j 100 Ω

-j 100 Ω

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Assertion (A): For satellites and space probes, PRF of a radar is pretty low.

Reason (R): PRF of a radar depends on the range of a radar.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

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An S/N ratio of 3 expressed in db is

4.8 dB

2.4 dB

0.48 dB

0.24 dB

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The material used for the magnet of moving coil cone type loudspeaker is

steel alloy

soft iron

hard steel

Alnico

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CCIR system B employs

625 lines

625 lines with 2 : 1 interlace

625 lines with 4 : 1 interlace

500 lines with 2 : 1 interlace

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The power to the base unit of a cordless telephone is supplied by

battery

AC mains

both battery and AC mains

either battery or AC mains