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Online Electronics and Communication Engineering Test - Radio Receivers Test

Instruction:
  • This is a FREE online test. Beware of scammers who ask for money to attend this test.
  • Total number of questions: 20.
  • Time allotted: 30 minutes.
  • Each question carries 1 mark; there are no negative marks.
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  • All the best!

Marks : 2/20

Total number of questions
20
Number of answered questions
0
Number of unanswered questions
20
Test Review : View answers and explanation for this test.
1.
As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?
High gain and better sensitivity
Better selectivity at high frequencies
Stability
Noise suppression
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2.
In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
750 kHz
990 kHz
1650 kHz
2100 kHz
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3.
In a ratio detector
the linearity is worse than in a phase discriminator
the output is twice that obtainable from a similar phase discriminator
stabilization against signal strength variations is provided
the circuit is the same as in a discriminator, except that the diodes are reversed
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4.
In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 25 MHz will be
24.09 MHz
24.54 MHz
25.45 MHz
25.91 MHz
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5.
Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?
Variable selectivity
Variable sensitivity
Double conversion
Squelch
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6.
Padders are used in a receiver to
discard the carrier
facilitate tracking
filter the input signal
suppress noise
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7.
Modulated carrier power in FM
increases with modulating signal power
decreases with modulating signal power
is independent of the modulating signal power
none
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8.
An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is
114 kW
336 kW
384 kW
455 kW
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9.
A heterodyne frequency changer is called a
Modulator
Mixer
Demodulator
Frequency translator
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10.
In a transistor receiver, the use of FET as the first stage amplifier is likely to
improve selectivity of the receiver
improve the effectiveness of the AGC
reduce the effect of negative peak clipping
reduce the effect of noise at all frequencies
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11.
The typical squelch circuit
cuts off an IF amplifier when the AGC is maximum
cuts off an IF amplifier when the AGC is minimum
cuts off an audio amplifier when the carrier is absent
eliminates the RF interference when the signal is weak
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12.
Double spotting in a receiver is due to
poor sensitivity of RF amplifier
high gain of IF amplifier
inadequate image frequency rejection
all of the above
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13.
In a receiver, which of the following device has RF input but IF output?
Loudspeaker
Frequency changer
Demodulator
Audio amplifier
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14.
The passband of the tuned circuits of a radio receiver should be equal to
20 kHz
455 kHz
1455 kHz
more than 455 kHz
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15.
A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of
Mf
Mf/2
2Mf
UMf
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16.
In a FM waveform, the side bands are spaced at intervals equal to
four times the modulating frequency
twice the modulating frequency
half the modulating frequency
modulating frequency
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17.
The IF stage of a receiver employs
capacitive coupling
impedance coupling
double-tuned transformer coupling
single-tuned transformer coupling
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18.
Which of the following circuit cannot be used to demodulate SSB?
Phase discriminator
Produce detector
Balanced modulator
Beat frequency oscillator
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19.
The source of which of the following noise is different from that of the remaining?
Solar noise
Cosmic noise
Galactic noise
Atmospheric noise
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20.
A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. Its channel capacity is
1.6 kbps
16 kbps
32 kbps
256 kbps
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*** END OF THE TEST ***
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