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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