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