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Electrical Engineering
Radio Receivers
Quiz 1
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Q.1
Indicate the false statement in connection with communications receivers.
The noise limiter cuts off the receiver’s output during a noise pulse.
A product demodulator could be used for the reception of Morse code.
Double conversion is used to improve image rejection
Variable sensitivity is used to eliminate selective fading
Q.2
One of the main functions of the RF amplifier in a superheterodyne receiver is to
Provide improved tracking
Permit better adjacent-channel rejection
Increase the tuning range of the receiver
Improve the rejection of the image frequency
Q.3
The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to
Reduce the spurious frequency problem
Increase the frequency stability of the synthesizer
Reduce the number of decades
Reduce the number of crystals required
Q.4
The image frequency of a superheterodyne receiver
Is created within the receiver itself
Is due to insufficient adjacent channel rejection
Is not rejected be the IF tuned circuits
Is independent of the frequency to which the receiver is tuned
Q.5
An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive
Single-sideband, suppressed-carrier
Single-sideband, reduced-carrier
ISB
Single-sideband, full-carrier
Q.6
In a ratio detector
the linearity is worse than in phase discriminator
stabilization against signal strength variations is provided
the output is twice that obtainable from a similar phase discriminator
the circuit is the same as in a discriminator, except that the diodes are reversed
Q.7
The controlled oscillator synthesizer is sometimes preferred over the direct one because
It is a simpler piece of equipment
Its frequency stability is better
It does not require crystal oscillator
It is relatively free of spurious frequency
Q.8
A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
750 kHz
900 kHz
1650 kHz
2100 kHz
Q.9
In a broadcast superheterodyne receiver, the
Local oscillator operates below the signal frequency
Mixer input must be tuned to the signal frequency
Local oscillator frequency is normally double the IF
RF amplifier normally works at 455 kHz above the carrier frequency
Q.10
Three-point tracking is achieved with
Variable selectivity
The padder capacitor
Double spotting
Double conversion
Q.11
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that
The receiver cannot use a phase comparator for AFC
Adjacent-channel rejection is more difficult
Production of AGC is a rather complicated process
The transmission is not compatible with A3E
Q.12
In a radio receiver with simple AGC
An increase in signal strength produces more AGC
The audio stage gain is normally controlled by the AGC
The faster the AGC time constant the more accurate the output
The highest AGC voltage is produced
Q.13
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency
To help the image frequency rejection
To permit easier tracking
Because otherwise an intermediate frequency could not be produced
To allow adequate frequency coverage without switching
Q.14
Show which of the following statements about the amplitude limiter is untrue:
The circuit is always biased in class C, by virtue of the leak-type bias.
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
The output must be tuned
Leak-type bias must be used
Q.15
To prevent overloading of the IF amplifier in a receiver, one should use
Squelch
Variable sensitivity
Variable selectivity
Double conversion
Q.16
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of
Improving the effectiveness of the AGC
Reducing the effect of negative-peak clipping
Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver
Q.17
A receiver has poor IF selectivity. It will therefore also have poor
Blocking
Double-spotting
Diversion reception
Sensitivity
Q.18
Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from
Gain variation over the frequency coverage range
Insufficient gain and sensitivity
Inadequate selectivity at high frequencies
Instability
Q.19
The typical squelch circuit cuts off
an audio amplifier when the carrier is absent
RF interference when the signal is weak
An IF amplifier when the AGC is maximum
An IF amplifier when the AGC is minimum
Q.20
When a receiver has good blocking performance, this means that
It does not suffer from double-spotting
Its image frequency rejection is poor
It is unaffected by AGC derived from nearby transmissions
Its detector suffers from burnout
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