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General Class Exam Question Pool

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

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G4B-2011: Test and monitoring equipment; two-tone test

G4B01-2011: What item of test equipment contains horizontal and vertical channel amplifiers?

An oscilloscope

An ohmmeter

A signal generator

An ammeter



G4B02-2011: Which of the following is an advantage of an oscilloscope versus a digital voltmeter?

Complex waveforms can be measured

An oscilloscope uses less power

Complex impedances can be easily measured

Input impedance is much lower



G4B03-2011: Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?

An oscilloscope

A field-strength meter

A sidetone monitor

A wavemeter



G4B04-2011: What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?

The attenuated RF output of the transmitter

The local oscillator of the transmitter

An external RF oscillator

The transmitter balanced mixer output



G4B05-2011: Why is high input impedance desirable for a voltmeter?

It decreases the loading on circuits being measured

It improves the frequency response

It decreases battery consumption in the meter

It improves the resolution of the readings



G4B06-2011: What is an advantage of a digital voltmeter as compared to an analog voltmeter?

Better precision for most uses

Better for measuring computer circuits

Better for RF measurements

Faster response



G4B07-2011: Which of the following might be a use for a field strength meter?

Close-in radio direction-finding

A modulation monitor for a frequency or phase modulation transmitter

An overmodulation indicator for a SSB transmitter

A keying indicator for a RTTY or packet transmitter



G4B08-2011: Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?

A field-strength meter

An antenna noise bridge

A multimeter

A Q meter



G4B09-2011: Which of the following can be determined with a field strength meter?

The radiation pattern of an antenna

The radiation resistance of an antenna

The presence and amount of phase distortion of a transmitter

The presence and amount of amplitude distortion of a transmitter



G4B10-2011: Which of the following can be determined with a directional wattmeter?

Standing wave ratio

Antenna front-to-back ratio

RF interference

Radio wave propagation



G4B11-2011: Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?

Antenna and feed line

Receiver

Transmitter

All of these choices are correct



G4B12-2011: What problem can occur when making measurements on an antenna system with an antenna analyzer?

Strong signals from nearby transmitters can affect the accuracy of measurements

SWR readings may be incorrect if the antenna is too close to the Earth

The analyzer can be damaged if measurements outside the ham bands are attempted

Connecting the analyzer to an antenna can cause it to absorb harmonics



G4B13-2011: What is a use for an antenna analyzer other than measuring the SWR of an antenna system?

Determining the impedance of an unknown or unmarked coaxial cable

Measuring the front to back ratio of an antenna

Measuring the turns ratio of a power transformer

Determining the gain of a directional antenna



G4B14-2011: What is an instance in which the use of an instrument with analog readout may be preferred over an instrument with a numerical digital readout?

When adjusting tuned circuits

When testing logic circuits

When high precision is desired

When measuring the frequency of an oscillator



G4B15-2011: What type of transmitter performance does a two-tone test analyze?

Linearity

Carrier and undesired sideband suppression

Percentage of frequency modulation

Percentage of carrier phase shift



G4B16-2011: What signals are used to conduct a two-tone test?

Two non-harmonically related audio signals

Two audio signals of the same frequency shifted 90-degrees

Two swept frequency tones

Two audio frequency range square wave signals of equal amplitude





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G4C-2011: Interference with consumer electronics; grounding; DSP
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