Electronics & Radio Theory Quiz - Competitive Exams Ham_Radio_Technician
Free practice quiz: Electronics & Radio Theory (Competitive Exams Ham_Radio_Technician). 252 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Why do VHF signal strengths sometimes vary greatly when the antenna is moved only a few feet?
- The signal path encounters different concentrations of water vapor
- VHF ionospheric propagation is very sensitive to path length
- Multipath propagation cancels or reinforces signals
- The Doppler effect causes slight frequency shifts which result in changes in signal strength
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Answer: C. Multipath propagation cancels or reinforces signals
What does an FM signal sound like when received slightly off frequency?
- The audio increases in pitch
- The audio decrease in pitch
- There is no effect except for reduction in amplitude
- The audio becomes distorted
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Answer: D. The audio becomes distorted
What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
- 9600 amperes
- 200 amperes
- 0.667 amperes
- 1.5 amperes
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Answer: D. 1.5 amperes
What is the function of the Variable Frequency Oscillator (VFO) circuit in a transceiver?
- Set the receive and transmit frequency
- Provide automatic frequency control
- Inject a variable frequency to allow CW reception
- Generate and demodulate single sideband signals
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Answer: A. Set the receive and transmit frequency
What does it mean if a satellite is operating in U/V mode?
- The satellite uplink is in the 15-meter band and the downlink is in the 10-meter band
- The satellite uplink is in the 70-centimeter band and the downlink is in the 2-meter band
- The satellite operates using ultraviolet frequencies
- The satellite frequencies are usually variable
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Answer: B. The satellite uplink is in the 70-centimeter band and the downlink is in the 2-meter band