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Question #521Radio Theory and Communication Principles

What frequency range is referred to as HF?

  1. 3 to 30 MHz ✓ Correct answer
  2. 30 to 300MHz
  3. 300 to 3000 kHz
  4. 300 to 3000 MHz.

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Question #522Radio Theory and Communication Principles

How many milliamperes is 1.5 amperes?

  1. 15 milliamperes
  2. 150 milliamperes
  3. 1500 milliamperes ✓ Correct answer
  4. 15,000 milliamperes

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Question #523Radio Theory and Communication Principles

Which sideband is normally used for 10meter HF, VHF and UHF single-side band communications?

  1. Upper sideband ✓ Correct answer
  2. Lower sideband
  3. Suppressed sideband
  4. Double sideband

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Question #524Radio Theory and Communication Principles

What is the primary advantage of single sideband over FM

  1. SSB signals are easier to tune
  2. SSB signals are less susceptible to interference ✓ Correct answer
  3. SSB signals have narrower bandwidth
  4. All the above options are correct

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Question #525Basic Electricity and Electronics

What term describes the number of times per second that an alternating current reverses direction?

  1. Pulse rate
  2. Speed ✓ Correct answer
  3. Wavelength
  4. Frequency

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Question #526Radio Theory and Communication Principles

What is the electrical term for the electromotive force (EMF) that causes electron flow?

  1. Voltage ✓ Correct answer
  2. Ampere-hours
  3. Capacitance
  4. Inductance

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Question #527Basic Electricity and Electronics

Which of the following is equivalent to 500 milliwatts?

  1. 0.02 watts
  2. 0.5 watts ✓ Correct answer
  3. 5 watts
  4. 50 watts

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Question #528Antennas and Radio Wave Propagation

A coaxial feed-line is constructed from

  1. a single conductor
  2. two parallel conductors separated by spacers
  3. braid and insulation around a central conductor ✓ Correct answer
  4. braid and insulation twisted together

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Question #529Basic Electricity and Electronics

What electrical component is used to disconnect electrical circuits?

  1. Zener Diode
  2. switch ✓ Correct answer
  3. inductor
  4. resistor

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Question #530Basic Electricity and Electronics

What electrical component is used to protect other circuit components from current overloads?

  1. Fuse ✓ Correct answer
  2. Capacitor
  3. Inductor
  4. switch

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Question #531Basic Electricity and Electronics

Which electronics component allows current to flow in only one direction?

  1. Resistor
  2. Fuse
  3. Diode ✓ Correct answer
  4. Capacitor

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Question #532Basic Electricity and Electronics

Which of these components can be used as an electronic switch or amplifier?

  1. Diode
  2. Potentiometer
  3. Transistor ✓ Correct answer
  4. Inductor

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Question #533Radio Theory and Communication Principles

How many micro-farads are 1,000,000 picofarads?

  1. 0.001 micro farads
  2. one micro farad ✓ Correct answer
  3. 1000 micro farad
  4. 10000 micro farads

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Question #534Radio Theory and Communication Principles

What type of modulation is most commonly used for VHF packet radio transmissions?

  1. FM ✓ Correct answer
  2. SSB
  3. AM
  4. Spread Spectrum

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Question #535Radio Theory and Communication Principles

Which type of voice modulation is most often used for long distance or weak signal contacts on the VHF and UHF hands?

  1. FM
  2. AM
  3. SSB ✓ Correct answer
  4. PM

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Question #536Radio Theory and Communication Principles

Which of the following types of emission has the narrowest bandwidth?

  1. FM voice
  2. SSB voice
  3. CW ✓ Correct answer
  4. Slow-scan TV

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Question #537Radio Theory and Communication Principles

One GHz is equal to

  1. 1000 kHz
  2. 10 MHz
  3. 100 MHz
  4. 1000 MHz ✓ Correct answer

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Question #538Basic Electricity and Electronics

Which of the following electronic components can amplify signals?

  1. Transistor ✓ Correct answer
  2. Variable resistor
  3. Electrolytic capacitor
  4. Diode

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Question #539Radio Theory and Communication Principles

What does the abbreviation “LED” stand for?

  1. Low Emission Diode
  2. Light Emitting Diode ✓ Correct answer
  3. Liquid Emission Detector
  4. None of the above

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Question #540Radio Theory and Communication Principles

What does the abbreviation “FET" stand for?

  1. Field Effect Transistor ✓ Correct answer
  2. Fast Electron Transistor
  3. Free Electron Transistor
  4. Field Emission Thickness

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