1
In TV transmission, sound signal is ………………… modulated
Answer: Frequency
Questions
2
In a TRF radio receiver, the RF and detection stages are tuned to …………
Answer: Radio frequency
3
The diode detector in an AM radio receiver is usually found ………….
Answer: After several stages of amplification
4
In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because …………….
Answer: Lower frequencies are easier to amplify
6
A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?
Answer: 50 kW
7
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?
Answer: 6
8
In a radio receiver, we generally use ………….. oscillator as a local oscillator
Answer: Hartley
9
The function of ferrite antenna is to …………….
Answer: Increase the Q of tuned circuit
10
If Amin = 40 and Amax = 60, what is the percentage of modulation?
Answer: 20 %
11
The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ………….
Answer: 1310 kHz
12
Modulation refers to a low-frequency signal controlling the …………
Answer: May be any of the above
13
When the modulating signal controls the frequency of the carrier, we get……….
Answer: Frequency modulation
15
In superhetrodyne receiver, the input at mixer stage is ……….
Answer: RF and local oscillator signal
18
Most of the amplification in a superhetrodyne receiver occurs at ………. stage
Answer: IF
19
a radio receiver amplifies all the signal frequencies equally well, it is said to have high …………
Answer: Fidelity
20
Superhertodyne principle refers to
Answer: Obtaining lower fixed intermediate frequency
