Television Engineering MCQs

Question 1

A TV antenna receives a reflected signal via a path which is 3 km longer than the direct signal path. If picture width is 55 cm and scan time for one horizontal line is 55 ps, the ghost image would be displaced from the original image by ___ cm.

Accepted Answer

10

Answer

2

Answer

4

Answer

5

Question 2

In order to eliminate ghosts in TV picture, one important method is to

Accepted Answer

change the antenna orientation or location

Answer

use longer transmission line

Answer

cannect a booster

Answer

use a multiband antenna

Question 3

Mark the false statement (s) :

Accepted Answer

a frequency swing of ?5 kHz corresponds to 5 per cent modulation for the TV sound signal

Answer

In FM, loudest sound produces maximum frequency deviation

Answer

the audio modulating frequency determines the rate of frequency swing in an FM transmitter

Answer

slope detection enables an AM receiver to detect FM signal "

Question 4

The reflector 'arm' for a simple folded-dipole Yagi antenna is called a/an

Accepted Answer

parasitic element

Answer

reflector element

Answer

mirror element

Answer

antenna loop

Question 5

T.V. broadcasting in India is done in

Accepted Answer

microwave band

Answer

U.H.F. band

Answer

V.H.F. band

Answer

None of above

Question 6

The impedance of 3-element Yagi receiving antenna is around

Accepted Answer

300 ohm

Answer

75 ohm

Answer

50 ohm

Answer

none of these

Question 7

Television transmitting antennas are

Accepted Answer

omnidirectional

Answer

unidirectional

Answer

bidirectional

Answer

directional

Question 8

A folded-di gole antenna used with television receivers has a terminal impedance of___ohms at its resonance frequency.

Accepted Answer

300

Answer

75

Answer

50

Answer

150

Question 9

In any transmitting antenna system, efficiency primarily depends upon

Accepted Answer

radiation resistance

Answer

ohmic losses of various conductors

Answer

ground conductivity

Answer

atmospheric conditions