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NEW Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

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2016-E7B: Amplifiers: Class of operation; vacuum tube and solid-state circuits; distortion and intermodulation; spurious and parasitic suppression; microwave amplifiers; switching-type amplifiers

2016-E7B01: For what portion of a signal cycle does a Class AB amplifier operate?

More than 180 degrees but less than 360 degrees

Exactly 180 degrees

The entire cycle

Less than 180 degrees

2016-E7B02: What is a Class D amplifier?

A type of amplifier that uses switching technology to achieve high efficiency

A low power amplifier that uses a differential amplifier for improved linearity

An amplifier that uses drift-mode FETs for high efficiency

A frequency doubling amplifier

2016-E7B03: Which of the following components form the output of a class D amplifier circuit?

A low-pass filter to remove switching signal components

A high-pass filter to compensate for low gain at low frequencies

A matched load resistor to prevent damage by switching transients

A temperature compensating load resistor to improve linearity

2016-E7B04: Where on the load line of a Class A common emitter amplifier would bias normally be set?

Approximately half-way between saturation and cutoff

Where the load line intersects the voltage axis

At a point where the bias resistor equals the load resistor

At a point where the load line intersects the zero bias current curve

2016-E7B05: What can be done to prevent unwanted oscillations in an RF power amplifier?

Install parasitic suppressors and/or neutralize the stage

Tune the stage for maximum SWR

Tune both the input and output for maximum power

Use a phase inverter in the output filter

2016-E7B06: Which of the following amplifier types reduces or eliminates even order harmonics?



Class C

Class AB

2016-E7B07: Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal?

Signal distortion and excessive bandwidth

Reduced intermodulation products

Increased overall intelligibility

Signal inversion

2016-E7B08: How can an RF power amplifier be neutralized?

By feeding a 180-degree out-of-phase portion of the output back to the input

By increasing the driving power

By reducing the driving power

By feeding an in-phase component of the output back to the input

2016-E7B09: Which of the following describes how the loading and tuning capacitors are to be adjusted when tuning a vacuum tube RF power amplifier that employs a Pi-network output circuit?

The tuning capacitor is adjusted for minimum plate current, and the loading capacitor is adjusted for maximum permissible plate current

The loading capacitor is set to maximum capacitance and the tuning capacitor is adjusted for minimum allowable plate current

The tuning capacitor is set to maximum capacitance and the loading capacitor is adjusted for minimum plate permissible current

The loading capacitor is adjusted to minimum plate current while alternately adjusting the tuning capacitor for maximum allowable plate current

2016-E7B10: In Figure E7-1, what is the purpose of R1 and R2?

Fixed bias

Load resistors

Self bias


2016-E7B11: In Figure E7-1, what is the purpose of R3?

Self bias

Fixed bias

Emitter bypass

Output load resistor

2016-E7B12: What type of amplifier circuit is shown in Figure E7-1?

Common emitter

Common base

Common collector

Emitter follower

2016-E7B13: In Figure E7-2, what is the purpose of R?

Emitter load

Fixed bias

Collector load

Voltage regulation

2016-E7B14: Why are switching amplifiers more efficient than linear amplifiers?

The power transistor is at saturation or cut off most of the time, resulting in low power dissipation

Switching amplifiers operate at higher voltages

Linear amplifiers have high gain resulting in higher harmonic content

Switching amplifiers use push-pull circuits

2016-E7B15: What is one way to prevent thermal runaway in a bipolar transistor amplifier?

Use a resistor in series with the emitter


Select transistors with high beta

All of these choices are correct

2016-E7B16: What is the effect of intermodulation products in a linear power amplifier?

Transmission of spurious signals

Creation of parasitic oscillations

Low efficiency

All of these choices are correct

2016-E7B17: Why are odd-order rather than even-order intermodulation distortion products of concern in linear power amplifiers?

Because they are relatively close in frequency to the desired signal

Because they are relatively far in frequency from the desired signal

Because they invert the sidebands causing distortion

Because they maintain the sidebands, thus causing multiple duplicate signals

2016-E7B18: What is a characteristic of a grounded-grid amplifier?

Low input impedance

High power gain

High filament voltage

Low bandwidth

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2016-E7A: Digital circuits: digital circuit principles and logic circuits: classes of logic elements; positive and negative logic; frequency dividers; truth tables
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2016-E7C: Filters and matching networks: types of networks; types of filters; filter applications; filter characteristics; impedance matching; DSP filtering
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