Receivers and transmitters; filters, oscillators
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General Class Exam Question Pool

effective 7/01/2011 thru 6/30/2015

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G7C-2011: Receivers and transmitters; filters, oscillators

G7C01-2011: Which of the following is used to process signals from the balanced modulator and send them to the mixer in a single-sideband phone transmitter?

Filter

Carrier oscillator

IF amplifier

RF amplifier



G7C02-2011: Which circuit is used to combine signals from the carrier oscillator and speech amplifier and send the result to the filter in a typical single-sideband phone transmitter?

Balanced modulator

Discriminator

Detector

IF amplifier



G7C03-2011: What circuit is used to process signals from the RF amplifier and local oscillator and send the result to the IF filter in a superheterodyne receiver?

Mixer

Balanced modulator

IF amplifier

Detector



G7C04-2011: What circuit is used to combine signals from the IF amplifier and BFO and send the result to the AF amplifier in a single-sideband receiver?

Product detector

RF oscillator

IF filter

Balanced modulator



G7C05-2011: Which of the following is an advantage of a transceiver controlled by a direct digital synthesizer (DDS)?

Variable frequency with the stability of a crystal oscillator

Wide tuning range and no need for band switching

Relatively high power output

Relatively low power consumption



G7C06-2011: What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?

About the same

Substantially higher

Substantially lower

Twice the transmission line impedance



G7C07-2011: What is the simplest combination of stages that implement a superheterodyne receiver?

HF oscillator, mixer, detector

RF amplifier, detector, audio amplifier

RF amplifier, mixer, IF discriminator

HF oscillator, pre-scaler, audio amplifier



G7C08-2011: What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?

Discriminator

Product detector

Phase inverter

Mixer



G7C09-2011: Which of the following is needed for a Digital Signal Processor IF filter?

All of the these choices are correct

An analog to digital converter

A digital to analog converter

A digital processor chip



G7C10-2011: How is Digital Signal Processor filtering accomplished?

By converting the signal from analog to digital and using digital processing

By using direct signal phasing

By differential spurious phasing

By converting the signal from digital to analog and taking the difference of mixing products



G7C11-2011: What is meant by the term "software defined radio" (SDR)?

A radio in which most major signal processing functions are performed by software

A radio which provides computer interface for automatic logging of band and frequency

A radio which uses crystal filters designed using software

A computer model which can simulate performance of a radio to aid in the design process





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