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General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

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2015-G7B: Digital circuits; amplifiers and oscillators

2015-G7B01: Complex digital circuitry can often be replaced by what type of integrated circuit?

Microcontroller

Charge-coupled device

Phase detector

Window comparator



2015-G7B02: Which of the following is an advantage of using the binary system when processing digital signals?

Binary "ones" and "zeros" are easy to represent by an "on" or "off" state

The binary number system is most accurate

Binary numbers are more compatible with analog circuitry

All of these choices are correct



2015-G7B03: Which of the following describes the function of a two input AND gate?

Output is high only when both inputs are high

Output is high when either or both inputs are low

Output is low when either or both inputs are high

Output is low only when both inputs are high



2015-G7B04: Which of the following describes the function of a two input NOR gate?

Output is low when either or both inputs are high

Output is high when either or both inputs are low

Output is high only when both inputs are high

Output is low only when both inputs are high



2015-G7B05: How many states does a 3-bit binary counter have?

8

3

6

16



2015-G7B06: What is a shift register?

A clocked array of circuits that passes data in steps along the array

An array of operational amplifiers used for tri-state arithmetic operations

A digital mixer

An analog mixer



2015-G7B07: What are the basic components of virtually all sine wave oscillators?

A filter and an amplifier operating in a feedback loop

An amplifier and a divider

A frequency multiplier and a mixer

A circulator and a filter operating in a feed-forward loop



2015-G7B08: How is the efficiency of an RF power amplifier determined?

Divide the RF output power by the DC input power

Divide the DC input power by the DC output power

Multiply the RF input power by the reciprocal of the RF output power

Add the RF input power to the DC output power



2015-G7B09: What determines the frequency of an LC oscillator?

The inductance and capacitance in the tank circuit

The number of stages in the counter

The number of stages in the divider

The time delay of the lag circuit



2015-G7B10: Which of the following is a characteristic of a Class A amplifier?

Low distortion

Low standby power

High Efficiency

No need for bias



2015-G7B11: For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?

CW

SSB

AM

All of these choices are correct



2015-G7B12: Which of these classes of amplifiers has the highest efficiency?

Class C

Class A

Class B

Class AB



2015-G7B13: What is the reason for neutralizing the final amplifier stage of a transmitter?

To eliminate self-oscillations

To limit the modulation index

To cut off the final amplifier during standby periods

To keep the carrier on frequency



2015-G7B14: Which of the following describes a linear amplifier?

An amplifier in which the output preserves the input waveform

Any RF power amplifier used in conjunction with an amateur transceiver

A Class C high efficiency amplifier

An amplifier used as a frequency multiplier





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2015-G7A: Power supplies; and schematic symbols
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2015-G7C: Receivers and transmitters; filters, oscillators
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