If Amin = 40 and Amax = 60, what is the percentage of modulation?
(A) 20 %
(B) 40 %
(C) 50 %
(D) 10 %
In a radio receiver, we generally use ………….. oscillator as a local oscillator
(A) Crystal
(B) Wien-bridge
(C) Phase-shift
(D) Hartley
In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?
(A) The difference frequency is closer to oscillator frequency
(B) Lower frequencies are easier to amplify
(C) Only the difference frequency can be modulated
(D) None of the above
In a TRF radio receiver, the RF and detection stages are tuned to______________?
(A) Radio frequency
(B) IF
(C) Audio frequency
(D) None of the above
In TV transmission, sound signal is ______________modulated?
(A) Amplitude
(B) Frequency
(C) Phase
(D) None of the above
The diode detector in an AM radio receiver is usually found _____________?
(A) Before the first RF stage
(B) After the first RF stage
(C) After several stages of amplification
(D) None of the above
Modulation refers to a low-frequency signal controlling the ________________?
(A) Amplitude of the carrier
(B) Frequency of the carrier
(C) Phase of the carrier
(D) May be any of the above
The major advantage of FM over AM is__________________?
(A) Reception is less noisy
(B) Higher carrier frequency
(C) Smaller bandwidth
(D) Small frequency deviation