HIGHWAY ENGINEERING QUIZ

In a radio receiver with simple AGC

The faster the AGC time constant the more accurate the output

An increase in signal strength produces more AGC

The highest AGC voltage is produced

The audio stage gain is normally controlled by the AGC

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When a receiver has good blocking performance, this means that

Its image frequency rejection is poor

It is unaffected by AGC derived from nearby transmissions

Its detector suffers from burnout

It does not suffer from double-spotting

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Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that

The receiver cannot use a phase comparator for AFC

The transmission is not compatible with A3E

Production of AGC is a rather complicated process

Adjacent-channel rejection is more difficult

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Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from

Insufficient gain and sensitivity

Gain variation over the frequency coverage range

Instability

Inadequate selectivity at high frequencies

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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

Reduce the number of decades

Increase the frequency stability of the synthesizer

Reduce the number of crystals required

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Three-point tracking is achieved with

Variable selectivity

The padder capacitor

Double conversion

Double spotting

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Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:

Fewer tuned circuits

Better linearity

Greater limiting

Much easier alignment

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In a ratio detector

stabilization against signal strength variations is provided

the linearity is worse than in phase discriminator

the circuit is the same as in a discriminator, except that the diodes are reversed

the output is twice that obtainable from a similar phase discriminator

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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 noise at low modulation depths

Improving the selectivity of the receiver

Reducing the effect of negative-peak clipping

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The controlled oscillator synthesizer is sometimes preferred over the direct one because

It is relatively free of spurious frequency

Its frequency stability is better

It is a simpler piece of equipment

It does not require crystal oscillator

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