The superhetrodyne principle provides selectivity at ______________stage?
A. RF
B. IF
C. audio
D. Before RF
Month: December 2018
Most of the amplification in a superhetrodyne receiver occurs at ______________stage?
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 ________________?
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 ________________?
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________________?
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______________?
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 _______________?
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
The function of ferrite antenna is to_________________?
The function of ferrite antenna is to_________________?
A. Reduce stray capacitance
B. Stabilise d.c. bias
C. Increase the Q of tuned circuit
D. Reduce noise
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?
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
If Amin = 40 and Amax = 60, what is the percentage of modulation?
If Amin = 40 and Amax = 60, what is the percentage of modulation?
A. 20 %
B. 40 %
C. 50 %
D. 10 %