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Free tnpsc model questions Online Test - MeritNotes
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No. of Questions :10
Remaining Time :
1. Modulation is a process of superimposing audio signal with
(a)
low frequency waves
(b)
high frequency waves
(c)
medium frequency waves
(d)
voice frequency waves
2. The music, speech, etc., are converted into audio signals using
(a)
oscillators
(b)
gramophone
(c)
microphone
(d)
loudspeaker
3. Modulation factor (m) =
(a)
Signal amplitude/Carrier frequency
(b)
Signal amplitude/Carrier amplitude
(c)
Phase of signal/Phase of carrier wave
(d)
Signal frequency/Carrier frequency
4. A transmitting antenna converts
(a)
electromagnetic energy into electrical energy
(b)
electrical signal into electromagnetic energy
(c)
sound energy into electromagnetic energy
(d)
electrical signal into sound energy
5. Radar works on the principle of
(a)
electromagnetic echoes
(b)
video echoes
(c)
radio echoes
(d)
none of the above
6. ______ couples the transmitter and the receiver to the space link.
(a)
Amplifier
(b)
Antenna
(c)
Loudspeaker
(d)
Microphone
7. Radio communication was first made possible by the invention of
(a)
semiconductors devices
(b)
IC chips
(c)
transistors
(d)
electronic valves
8. Microphone converts
(a)
electrical energy into electro-magnetic energy
(b)
sound energy into light energy
(c)
electrical energy into sound energy
(d)
sound energy into electrical energy
9. A television camera converts
(a)
light energy into sound energy
(b)
light energy into electrical energy
(c)
mechanical energy into electrical energy
(d)
mechanical energy into light energy
10. Radar transmitter is a high power
(a)
hartley oscillator
(b)
magnetron oscillator
(c)
transistor oscillator
(d)
RF oscillator
