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Canadian Advanced Exam Question Bank

effective 4/01/2007

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A-006-04: Detection, audio, automatic gain control

A-006-04-01: What audio shaping network is added at an FM receiver to restore proportionally attenuated lower audio frequencies?

A de-emphasis network

A pre-emphasis network

An audio prescaler

A heterodyne suppressor



A-006-04-02: What does a product detector do?

It mixes an incoming signal with a locally generated carrier

It provides local oscillations for input to a mixer

It amplifies and narrows band-pass frequencies

It detects cross-modulation products



A-006-04-03: Distortion in a receiver that only affects strong signals usually indicates a defect in the:

AGC

IF amplifier

AF amplifier

RF amplifier



A-006-04-04: In a superheterodyne receiver with AGC, as the strength of the signal increases, the AGC:

reduces the receiver gain

increases the receiver gain

distorts the signal

introduces limiting



A-006-04-05: The amplified IF signal is applied to the ____________ stage in a superheterodyne receiver:

detector

RF amplifier

audio output

HFO



A-006-04-06: The low-level output of a detector is:

applied to the AF amplifier

grounded via the chassis

fed directly to the speaker

applied to the RF amplifier



A-006-04-07: The overall output of an AM/CW/SSB receiver can be adjusted by means of manual controls on the receiver or by use of a circuit known as:

automatic gain control

automatic frequency control

inverse gain control

automatic load control



A-006-04-08: AGC voltage is applied to the:

RF and IF amplifiers

AF and IF amplifiers

RF and AF amplifiers

detector and AF amplifiers



A-006-04-09: AGC is derived in a receiver from one of two circuits. Depending on the method used, it is called:

IF derived or audio derived

RF derived or audio derived

IF derived or RF derived

detector derived or audio derived



A-006-04-10: In a superhetrodyne receiver, the output of an oscillator is connected to a transformer. What is the function of the transformer?

It provides coupling between the beat-frequency oscillator and the detector

It provides isolation between the high-frequency oscillator and the detector

It provides tuning for the output of the intermediate frequency amplifier

It provides tuning for the input of the intermediate frequency amplifier



A-006-04-11: What circuit combines signals from an IF amplifier stage and a beat-frequency oscillator (BFO), to produce an audio signal?

A detector circuit

An AGC circuit

A power supply circuit

A VFO circuit





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A-006-05: Performance limitations - instability, image, spurious, etc.
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