In TV transmission, picture signal is ______________ modulated?
(A) Frequency
(B) Phase
(C) Amplitude
(D) None of the above
In a radio receiver, noise is generally developed at _______________?
(A) IF stage
(B) Receiving antenna
(C) Audio stage
(D) RF stage
The signal voltage induced in the aerial of a radio receiver is of the order of ________________?
(A) mV
(B) µV
(C) V
(D) None of the above
Most of the amplification in a superhetrodyne receiver occurs at ______________stage?
(A) IF
(B) RF amplifier
(C) Audio amplifier
(D) Detector
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?
(A) Sensitivity
(B) Selectivity
(C) Distortion
(D) Fidelity
The letters AVC stand for ________________?
(A) Audio voltage control
(B) Abrupt voltage control
(C) Automatic volume control
(D) Automatic voltage control
In superhetrodyne receiver, the input at mixer stage is________________?
(A) IF and RF
(B) RF and AF
(C) IF and AF
(D) RF and local oscillator signal
When the modulating signal controls the frequency of the carrier, we get______________?
(A) Phase modulation
(B) Amplitude modulation
(C) Frequency modulation
(D) May be any one of the above
The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________?
(A) 455 kHz
(B) 1310 kHz
(C) 1500 kHz
(D) 1520 kHz
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
(A) 3
(B) 6
(C) 5
(D) None of the above