Q.1
As the modulation level is increased, the carrier power ___________
Q.2
Modulation refers to a low-frequency signal controlling the ___________
Q.3
In amplitude modulation, bandwidth is ___________ the audio signal frequency
Q.4
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?
Q.5
Man made noise are ___________ variations.
Q.6
In TV transmission, picture signal is ___________ modulated
Q.7
In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.
Q.8
In TV transmission, sound signal is ___________ modulated
Q.9
Most of the amplification in a superhetrodyne receiver occurs at ___________ stage
Q.10
The superhetrodyne principle provides selectivity at ___________ stage
Q.11
At 100% modulation, the power in each sideband is ___________ of that of carrier
Q.12
In a transmitter ___________ oscillator is used
Q.13
If level of modulation is increased ___________ power is increased
Q.14
Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude
Q.15
If modulation is 100% then signal amplitude is ___________ carrier amplitude
Q.16
The IF iskHz. If the radio receiver is tuned tokHz, the local oscillator frequency is ___________
  • 455 kHz
  • 1310 kHz
  • 1500 kHz
  • 1520 kHz
Q.17
In a TRF radio receiver, the RF and detection stages are tuned to ___________
  • Radio frequency
  • IF
  • Audio frequency
  • None of the above
Q.18
The letters AVC stand for ___________
  • Audio voltage control
  • Abrupt voltage control
  • Automatic volume control
  • Automatic voltage control
Q.19
Overmodulation results in ___________
  • Weakening of the signal
  • Excessive carrier power
  • Distortion
  • None of the above
Q.20
In superhetrodyne receiver, the input at mixer stage is ___________
  • IF and RF
  • RF and AF
  • IF and AF
  • RF and local oscillator signal
0 h : 0 m : 1 s