Electrical Engineering MCQs

Page No. 119

The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is _______________?


a455 kHz


b1310 kHz


c1500 kHz


d 1520 kHz


View Answer 1310 kHz

The function of ferrite antenna is to_________________?


aReduce stray capacitance


bStabilise d.c. bias


c Increase the Q of tuned circuit


dReduce noise



A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ?


a3


b6


c5


d None of the above


View Answer 6

If Amin = 40 and Amax = 60, what is the percentage of modulation?


a20 %


b 40 %


c50 %


d10 %


View Answer 20 %

In a radio receiver, we generally use ………….. oscillator as a local oscillator


aCrystal


bWien-bridge


cPhase-shift


dHartley


View Answer Hartley

A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?


a50 kW


b5 kW


c 8 kW


d 25 kW


View Answer 50 kW

As the modulation level is increased, the carrier power__________________?


aIs increased


b Remains the same


c Is decreased


dNone of the above


View Answer Remains the same

A high Q tuned circuit will permit an amplifier to have high __________________?


a Fidelity


b Frequency range


cSensitivity


dSelectivity


View Answer Selectivity

Man made noise are______________ variations?


aAmplitude


b Frequency


cPhase


dBoth phase and frequency


View Answer Amplitude

If level of modulation is increased ______________ power is increased?


aCarrier


bSideband


cCarrier as well as sideband


dNone of the above


View Answer Sideband

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