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
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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 nosie
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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
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If Amin = 40 and Amax = 60, what is the percentage of modulation?
A. 20 %
B. 40 %
C. 50 %
D. 10 %
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In a radio receiver, we generally use ………….. oscillator as a local oscillator
A. Crystal
B. Wien-bridge
C. Phase-shift
D. Hartley
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A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?
A. 50 kw
B. 5 kw
C. 8 kw
D. 25 kw
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As the modulation level is increased, the carrier power__________________?
A. Is increased
B. Remains the same
C. Is decreased
D. None of the above
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A high Q tuned circuit will permit an amplifier to have high __________________?
A. Fidelity
B. Frequency range
C. Sensitivity
D. Selectivity
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Man made noise are______________ variations?
A. Amplitude
B. Frequency
C. Phase
D. Both phase and frequency
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If level of modulation is increased ______________ power is increased?
A. Carrier
B. Sideband
C. Carrier as well as sideband
D. None of the above
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Word of the Day
15 Sep
Preferential
of or involving preference or partiality; constituting a favour or privilege.
ترجیحی، رعاعیتی، ترجیح پانےوالا

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