Amateur Radio Practices
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General Class Exam Question Pool

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

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Topic G4: Amateur Radio Practices


G4A-2011: Station Operation and setup

G4A01-2011: What is the purpose of the "notch filter" found on many HF transceivers?

To reduce interference from carriers in the receiver passband

To restrict the transmitter voice bandwidth

To eliminate receiver interference from impulse noise sources

To enhance the reception of a specific frequency on a crowded band



G4A02-2011: What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver?

It may be possible to reduce or eliminate interference from other signals

Interference from impulse noise will be eliminated

More stations can be accommodated within a given signal passband

Accidental out of band operation can be prevented



G4A03-2011: What is normally meant by operating a transceiver in "split" mode?

The transceiver is set to different transmit and receive frequencies

The radio is operating at half power

The transceiver is operating from an external power source

The transmitter is emitting a SSB signal, as opposed to DSB operation



G4A04-2011: What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?

A pronounced dip

A pronounced peak

No change will be observed

A slow, rhythmic oscillation



G4A05-2011: What is a purpose of using Automatic Level Control (ALC) with a RF power amplifier?

To reduce distortion due to excessive drive

To balance the transmitter audio frequency response

To reduce harmonic radiation

To increase overall efficiency



G4A06-2011: What type of device is often used to enable matching the transmitter output to an impedance other than 50 ohms?

Antenna coupler

Balanced modulator

SWR Bridge

Q Multiplier



G4A07-2011: What condition can lead to permanent damage when using a solid-state RF power amplifier?

Excessive drive power

Exceeding the Maximum Usable Frequency

Low input SWR

Shorting the input signal to ground



G4A08-2011: What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?

Maximum power output without exceeding maximum allowable plate current

Minimum SWR on the antenna

Minimum plate current without exceeding maximum allowable grid current

Highest plate voltage while minimizing grid current



G4A09-2011: Why is a time delay sometimes included in a transmitter keying circuit?

To allow time for transmit-receive changeover operations to complete properly before RF output is allowed

To prevent stations from talking over each other

To allow the transmitter power regulators to charge properly

To allow time for a warning signal to be sent to other stations



G4A10-2011: What is the purpose of an electronic keyer?

Automatic generation of strings of dots and dashes for CW operation

Automatic transmit/receive switching

VOX operation

Computer interface for PSK and RTTY operation



G4A11-2011: Which of the following is a use for the IF shift control on a receiver?

To avoid interference from stations very close to the receive frequency

To change frequency rapidly

To permit listening on a different frequency from that on which you are transmitting

To tune in stations that are slightly off frequency without changing your transmit frequency



G4A12-2011: Which of the following is a common use for the dual VFO feature on a transceiver?

To permit ease of monitoring the transmit and receive frequencies when they are not the same

To allow transmitting on two frequencies at once

To permit full duplex operation, that is transmitting and receiving at the same time

To facilitate computer interface



G4A13-2011: What is one reason to use the attenuator function that is present on many HF transceivers?

To reduce signal overload due to strong incoming signals

To reduce the transmitter power when driving a linear amplifier

To reduce power consumption when operating from batteries

To slow down received CW signals for better copy



G4A14-2011: How should the transceiver audio input be adjusted when transmitting PSK31 data signals?

So that the transceiver ALC system does not activate

So that the transceiver is at maximum rated output power

So that the transceiver operates at no more than 25% of rated power

So that the transceiver ALC indicator shows half scale






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






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

G4C01-2011: Which of the following might be useful in reducing RF interference to audio-frequency devices?

Bypass capacitor

Bypass inductor

Forward-biased diode

Reverse-biased diode



G4C02-2011: Which of the following could be a cause of interference covering a wide range of frequencies?

Arcing at a poor electrical connection

Not using a balun or line isolator to feed balanced antennas

Lack of rectification of the transmitter's signal in power conductors

The use of horizontal rather than vertical antennas



G4C03-2011: What sound is heard from an audio device or telephone if there is interference from a nearby single-sideband phone transmitter?

Distorted speech

A steady hum whenever the transmitter is on the air

On-and-off humming or clicking

Clearly audible speech



G4C04-2011: What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?

On-and-off humming or clicking

A CW signal at a nearly pure audio frequency

A chirpy CW signal

Severely distorted audio



G4C05-2011: What might be the problem if you receive an RF burn when touching your equipment while transmitting on an HF band, assuming the equipment is connected to a ground rod?

The ground wire has high impedance on that frequency

Flat braid rather than round wire has been used for the ground wire

Insulated wire has been used for the ground wire

The ground rod is resonant



G4C06-2011: What effect can be caused by a resonant ground connection?

High RF voltages on the enclosures of station equipment

Overheating of ground straps

Corrosion of the ground rod

A ground loop



G4C07-2011: What is one good way to avoid unwanted effects of stray RF energy in an amateur station?

Connect all equipment grounds together

Install an RF filter in series with the ground wire

Use a ground loop for best conductivity

Install a few ferrite beads on the ground wire where it connects to your station



G4C08-2011: Which of the following would reduce RF interference caused by common-mode current on an audio cable?

Placing a ferrite bead around the cable

Adding series capacitors to the conductors

Adding shunt inductors to the conductors

Adding an additional insulating jacket to the cable



G4C09-2011: How can a ground loop be avoided?

Connect all ground conductors to a single point

Connect all ground conductors in series

Connect the AC neutral conductor to the ground wire

Avoid using lock washers and star washers when making ground connections



G4C10-2011: What could be a symptom of a ground loop somewhere in your station?

You receive reports of "hum" on your station's transmitted signal

The SWR reading for one or more antennas is suddenly very high

An item of station equipment starts to draw excessive amounts of current

You receive reports of harmonic interference from your station



G4C11-2011: Which of the following is one use for a Digital Signal Processor in an amateur station?

To remove noise from received signals

To provide adequate grounding

To increase antenna gain

To increase antenna bandwidth



G4C12-2011: Which of the following is an advantage of a receiver Digital Signal Processor IF filter as compared to an analog filter?

A wide range of filter bandwidths and shapes can be created

Fewer digital components are required

Mixing products are greatly reduced

The DSP filter is much more effective at VHF frequencies



G4C13-2011: Which of the following can perform automatic notching of interfering carriers?

A Digital Signal Processor (DSP) filter

Band-pass tuning

Balanced mixing

A noise limiter






G4D-2011: Speech processors; S meters; sideband operation near band edges

G4D01-2011: What is the purpose of a speech processor as used in a modern transceiver?

Increase the intelligibility of transmitted phone signals during poor conditions

Increase transmitter bass response for more natural sounding SSB signals

Prevent distortion of voice signals

Decrease high-frequency voice output to prevent out of band operation



G4D02-2011: Which of the following describes how a speech processor affects a transmitted single sideband phone signal?

It increases average power

It increases peak power

It reduces harmonic distortion

It reduces intermodulation distortion



G4D03-2011: Which of the following can be the result of an incorrectly adjusted speech processor?

All of these choices are correct

Distorted speech

Splatter

Excessive background pickup



G4D04-2011: What does an S meter measure?

Received signal strength

Conductance

Impedance

Transmitter power output



G4D05-2011: How does an S meter reading of 20 dB over S-9 compare to an S-9 signal, assuming a properly calibrated S meter?

It is 100 times stronger

It is 10 times weaker

It is 20 times weaker

It is 20 times stronger



G4D06-2011: Where is an S meter found?

In a receiver

In an SWR bridge

In a transmitter

In a conductance bridge



G4D07-2011: How much must the power output of a transmitter be raised to change the S-meter reading on a distant receiver from S8 to S9?

Approximately 4 times

Approximately 1.5 times

Approximately 2 times

Approximately 8 times



G4D08-2011: What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

7.175 to 7.178 MHz

7.178 to 7.181 MHz

7.178 to 7.184 MHz

7.1765 to 7.1795 MHz



G4D09-2011: What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?

14.347 to 14.350 MHz

14.347 to 14.647 MHz

14.344 to 14.347 MHz

14.3455 to 14.3485 MHz



G4D10-2011: How close to the lower edge of the 40 meter General Class phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?

3 kHz above the edge of the segment

3 kHz below the edge of the segment

Your displayed carrier frequency may be set at the edge of the segment

Center your signal on the edge of the segment



G4D11-2011: How close to the upper edge of the 20 meter General Class band should your displayed carrier frequency be when using 3 kHz wide USB?

3 kHz below the edge of the band

3 kHz above the edge of the band

Your displayed carrier frequency may be set at the edge of the band

Center your signal on the edge of the band






G4E-2011: HF mobile radio installations; emergency and battery powered operation

G4E01-2011: What is a "capacitance hat", when referring to a mobile antenna?

A device to electrically lengthen a physically short antenna

A device to increase the power handling capacity of a mobile whip antenna

A device that allows automatic band-changing for a mobile antenna

A device that allows remote tuning of a mobile antenna



G4E02-2011: What is the purpose of a "corona ball" on a HF mobile antenna?

To reduce high voltage discharge from the tip of the antenna

To narrow the operating bandwidth of the antenna

To increase the "Q" of the antenna

To reduce the chance of damage if the antenna should strike an object



G4E03-2011: Which of the following direct, fused power connections would be the best for a 100-watt HF mobile installation?

To the battery using heavy gauge wire

To the alternator or generator using heavy gauge wire

To the battery using resistor wire

To the alternator or generator using resistor wire



G4E04-2011: Why is it best NOT to draw the DC power for a 100-watt HF transceiver from an automobile's auxiliary power socket?

The socket's wiring may be inadequate for the current being drawn by the transceiver

The socket is not wired with an RF-shielded power cable

The DC polarity of the socket is reversed from the polarity of modern HF transceivers

Drawing more than 50 watts from this socket could cause the engine to overheat



G4E05-2011: Which of the following most limits the effectiveness of an HF mobile transceiver operating in the 75 meter band?

The antenna system

“Picket Fencing” signal variation

The wire gauge of the DC power line to the transceiver

FCC rules limiting mobile output power on the 75 meter band



G4E06-2011: What is one disadvantage of using a shortened mobile antenna as opposed to a full size antenna?

Operating bandwidth may be very limited

Short antennas are more likely to cause distortion of transmitted signals

Short antennas can only receive vertically polarized signals

Harmonic radiation may increase



G4E07-2011: Which of the following is the most likely to cause interfering signals to be heard in the receiver of an HF mobile installation in a recent model vehicle?

The vehicle control computer

The battery charging system

The anti-lock braking system

The anti-theft circuitry



G4E08-2011: What is the name of the process by which sunlight is changed directly into electricity?

Photovoltaic conversion

Photon emission

Photosynthesis

Photon decomposition



G4E09-2011: What is the approximate open-circuit voltage from a modern, well-illuminated photovoltaic cell?

0.5 VDC

0.02 VDC

0.2 VDC

1.38 VDC



G4E10-2011: What is the reason a series diode is connected between a solar panel and a storage battery that is being charged by the panel?

The diode prevents self discharge of the battery through the panel during times of low or no illumination

The diode serves to regulate the charging voltage to prevent overcharge

The diode limits the current flowing from the panel to a safe value

The diode greatly increases the efficiency during times of high illumination



G4E11-2011: Which of the following is a disadvantage of using wind as the primary source of power for an emergency station?

A large energy storage system is needed to supply power when the wind is not blowing

The conversion efficiency from mechanical energy to electrical energy is less than 2 percent

The voltage and current ratings of such systems are not compatible with amateur equipment

All of these choices are correct





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