General Class License Exam Questions
Amateur Radio Practices
Question Display Options:
Group G4A Station operation and setup
G4A01 What is the purpose of the "notch filter" found on many HF transceivers?
G4A02 What is one advantage of selecting the opposite or "reverse" sideband when receiving CW signals on a typical HF transceiver?
G4A03 What is normally meant by operating a transceiver in "split" mode?
G4A04 What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?
G4A05 What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?
G4A06 What type of device is often used to match transmitter output impedance to an impedance not equal to 50 ohms?
G4A07 What condition can lead to permanent damage to a solid-state RF power amplifier?
G4A08 What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?
G4A09 Why is a time delay sometimes included in a transmitter keying circuit?
G4A10 What is the purpose of an electronic keyer?
G4A11 Which of the following is a use for the IF shift control on a receiver?
G4A12 Which of the following is a common use for the dual VFO feature on a transceiver?
G4A13 What is one reason to use the attenuator function that is present on many HF transceivers?
G4A14 What is likely to happen if a transceiver's ALC system is not set properly when transmitting AFSK signals with the radio using single sideband mode?
G4A15 Which of the following can be a symptom of transmitted RF being picked up by an audio cable carrying AFSK data signals between a computer and a transceiver?
Group G4B Test and monitoring equipment; two-tone test
G4B01 What item of test equipment contains horizontal and vertical channel amplifiers?
G4B02 Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
G4B03 Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?
G4B04 What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?
G4B05 Why is high input impedance desirable for a voltmeter?
G4B06 What is an advantage of a digital voltmeter as compared to an analog voltmeter?
G4B07 What signals are used to conduct a two-tone test?
G4B08 Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?
G4B09 Which of the following can be determined with a field strength meter?
G4B10 Which of the following can be determined with a directional wattmeter?
G4B11 Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
G4B12 What problem can occur when making measurements on an antenna system with an antenna analyzer?
G4B13 What is a use for an antenna analyzer other than measuring the SWR of an antenna system?
G4B14 What is an instance in which the use of an instrument with analog readout may be preferred over an instrument with a digital readout?
G4B15 What type of transmitter performance does a two-tone test analyze?
Group G4C Interference with consumer electronics; grounding; DSP
G4C01 Which of the following might be useful in reducing RF interference to audio frequency devices?
G4C02 Which of the following could be a cause of interference covering a wide range of frequencies?
G4C03 What sound is heard from an audio device or telephone if there is interference from a nearby single sideband phone transmitter?
G4C04 What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?
G4C05 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?
G4C06 What effect can be caused by a resonant ground connection?
G4C07 What is one good way to avoid unwanted effects of stray RF energy in an amateur station?
G4C08 Which of the following would reduce RF interference caused by common-mode current on an audio cable?
G4C09 How can a ground loop be avoided?
G4C10 What could be a symptom of a ground loop somewhere in your station?
G4C11 Which of the following is a function of a digital signal processor?
G4C12 Which of the following is an advantage of a receiver DSP IF filter as compared to an analog filter?
G4C13 Which of the following can perform automatic notching of interfering carriers?
Group G4D Speech processors; S meters; sideband operation near band edges
G4D01 What is the purpose of a speech processor as used in a modern transceiver?
G4D02 Which of the following describes how a speech processor affects a transmitted single sideband phone signal?
G4D03 Which of the following can be the result of an incorrectly adjusted speech processor?
G4D04 What does an S meter measure?
G4D05 How does a signal that reads 20 dB over S9 compare to one that reads S9 on a receiver, assuming a properly calibrated S meter?
G4D06 Where is an S meter found?
G4D07 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?
G4D08 What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?
G4D09 What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
G4D10 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?
G4D11 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?
Group G4E HF mobile radio installations; emergency and battery powered operation
G4E01 What is the purpose of a capacitance hat on a mobile antenna?
G4E02 What is the purpose of a corona ball on a HF mobile antenna?
G4E03 Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?
G4E04 Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle's auxiliary power socket?
G4E05 Which of the following most limits the effectiveness of an HF mobile transceiver operating in the 75-meter band?
G4E06 What is one disadvantage of using a shortened mobile antenna as opposed to a full size antenna?
G4E07 Which of the following may cause interference to be heard in the receiver of an HF radio installed in a recent model vehicle?
G4E08 What is the name of the process by which sunlight is changed directly into electricity?
G4E09 What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?
G4E10 What is the reason that a series diode is connected between a solar panel and a storage battery that is being charged by the panel?
G4E11 Which of the following is a disadvantage of using wind as the primary source of power for an emergency station?