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 ___________
Q.17.
In a TRF radio receiver, the RF and detection stages are tuned to ___________
Q.18.
The letters AVC stand for ___________
Q.19.
Overmodulation results in ___________
Q.20.
In superhetrodyne receiver, the input at mixer stage is ___________