In the television system in India, each frame is scanned

Electronics and Communication Engineering (ECE) : Communication Systems - Quiz(MCQ)

10 times

20 times

50 times

100 times

Correct Answer : Option (C) : 50 times

Explanation : Each frame is divided into odd and even fields. Each field is scanned 25 times so that each frame is scanned 50 times.

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In TV scanning sequence of lines is

right to left

left to right

left to right for odd fields and right to left for even field

left to right for even fields and right to left for odd field

Correct Answer : left to right

Which of the following terms are applicable to troposcatter propagation?

SIOs

Fading

Faradays rotation

Atmospheric storms

Correct Answer : Fading

Explanation : Tropospheric scatter propagation is subject to two types of fading called Rayleigh fading (due to multipath propagation) and fading due to variations in atmospheric conditions along the propagation path.

A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about

1.3 mm

130 mm

13 mm

None of the above

Correct Answer : 13 mm

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