3.3 KiB
3.3 KiB
G4B – Tests and test equipment
- G4B01 (D)
What item of test equipment contains horizontal and vertical channel amplifiers?
- A. An ohmmeter
- B. A signal generator
- C. An ammeter
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D. An oscilloscope
- G4B02 (D)
Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
- A. An oscilloscope uses less power
- B. Complex impedances can be easily measured
- C. Greater precision
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D. Complex waveforms can be measured
- G4B03 (A)
Which of the following is the best instrument to use for checking the keying waveform of a CW transmitter?
- A. An oscilloscope
- B. A field strength meter
- C. A sidetone monitor
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D. A wavemeter
- G4B04 (D)
What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?
- A. The local oscillator of the transmitter
- B. An external RF oscillator
- C. The transmitter balanced mixer output
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D. The attenuated RF output of the transmitter
- G4B05 (D)
Why do voltmeters have high input impedance?
- A. It improves the frequency response
- B. It allows for higher voltages to be safely measured
- C. It improves the resolution of the readings
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D. It decreases the loading on circuits being measured
- G4B06 (C)
What is an advantage of a digital multimeter as compared to an analog multimeter?
- A. Better for measuring computer circuits
- B. Less prone to overload
- C. Higher precision
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D. Faster response
- G4B07 (B)
What signals are used to conduct a two-tone test?
- A. Two audio signals of the same frequency shifted 90 degrees
- B. Two non-harmonically related audio signals
- C. Two swept frequency tones
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D. Two audio frequency range square wave signals of equal amplitude
- G4B08 (A)
What transmitter performance parameter does a two-tone test analyze?
- A. Linearity
- B. Percentage of suppression of the carrier and undesired sideband for SSB
- C. Percentage of frequency modulation
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D. Percentage of carrier phase shift
- G4B09 (D)
When is an analog multimeter preferred to a digital multimeter?
- A. When testing logic circuits
- B. When high precision is desired
- C. When measuring the frequency of an oscillator
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D. When adjusting circuits for maximum or minimum values
- G4B10 (A)
Which of the following can be determined with a directional wattmeter?
- A. Standing wave ratio
- B. Antenna front-to-back ratio
- C. RF interference
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D. Radio wave propagation
- G4B11 (C)
Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
- A. Receiver
- B. Transmitter
- C. Antenna and feed line
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D. All these choices are correct
- G4B12 (B)
What effect can strong signals from nearby transmitters have on an antenna analyzer?
- A. Desensitization which can cause intermodulation products which interfere with impedance readings
- B. Received power that interferes with SWR readings
- C. Generation of harmonics which interfere with frequency readings
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D. All these choices are correct
- G4B13 (C)
Which of the following can be measured with an antenna analyzer?
- A. Front-to-back ratio of an antenna
- B. Power output from a transmitter
- C. Impedance of coaxial cable
- D. Gain of a directional antenna