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Interlacing is used in TV frames to
A) Ensure scanning of all lines B) Avoid flicker
C) Produce illusion of motion D) None of the above

In RGB colour model used in TV, complementary colour of green is
A) Yellow B) Red C) Cyan D) Magenta

A degaussing coil in colour television is used for
A) Demagnetising transformer core

B) Demagnetising colour picture tube

C) Rotating directional antenna

D) Trap circuit

Which of the phenomenon caused, when Radio waves travel in two or more paths during
propagation and produce slowly-changing phase differences between signals at the
receiving end

A) Fading B) Absorption C) Doppler shift D) Diffraction

The region between the far end of ground waves received to the nearest point where the
sky waves returns to earth is called as

A) Angle of radiation B) Skip distance

C) Skip zone D) Multiple skip

The mechanism that causes the electromagnetic waves to return back to earth by anyone
of layers of ionosphere is

A) Only Reflection B) Only Refraction

C) Only Diffraction D) None of the above

60 percentage of modulation is given to the carrier of an AM signal that has power of
1000 watts. Calculate the power in lower sideband.

A) 600 watts B) 180 watts C) 90 watts D) 320 watts
The major advantage of frequency modulation over amplitude modulation is
A) Small frequency deviation B) Higher carrier frequency

C) Smaller bandwidth D) Reception is less noisy

Phase locked loop can be used as
A) AM demodulator B) FM demodulator
C) AM receiver D) FM receiver

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