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Question #201Radio Theory and Communication Principles

How many milliamperes is the same as 1.5 amperes?

  1. 15 milliamperes
  2. 150 milliamperes
  3. 1500 milliamperes ✓ Correct answer
  4. 15000 mill amperes

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Question #202Radio Theory and Communication Principles

What is another way to specify the frequency of a radio signal that is oscillating at 1,500,000 Hertz?

  1. 1500 kHz ✓ Correct answer
  2. 1500 MHz
  3. 15 GHz
  4. 150 kHz

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Question #203Radio Theory and Communication Principles

How many volts are equal to one kilovolt?

  1. One one-thousandth of a volt
  2. one hundred volts
  3. one thousand volts ✓ Correct answer
  4. one million volts

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Question #204Radio Theory and Communication Principles

How many volts are equal to one microvolt?

  1. one one-millionth of a volt ✓ Correct answer
  2. one million volts
  3. one thousand kilovolts
  4. one one-thousandth of a volt
Explanation: One microvolt is 10⁻⁶ volt, or one-millionth of a volt.

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Question #205Basic Electricity and Electronics

How many watts does a hand-held transceiver put out if the output power is 500 mill watts?

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

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Question #206Basic Electricity and Electronics

What will happen to the resistance if the temperature of a carbon resistor is increased?

  1. It will increase by 20% for every 10 degrees centigrade
  2. It will stay the same
  3. It will change depending on the resistor's temperature coefficient rating ✓ Correct answer
  4. It will become time dependent

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Question #207Basic Electricity and Electronics

What type of capacitor is often used in power-supply circuits to filter the rectified AC?

  1. Disc ceramic
  2. Vacuum variable
  3. Mica
  4. Electrolytic ✓ Correct answer

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Question #208Basic Electricity and Electronics

Which of the following is the primary advantage of ceramic capacitors?

  1. Tight tolerance
  2. High stability
  3. High capacitance for given volume
  4. Comparatively low cost ✓ Correct answer

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Question #209Basic Electricity and Electronics

Which of the following is an advantage of an electrolytic capacitor?

  1. Tight tolerance
  2. Non-polarized
  3. High capacitance for given volume ✓ Correct answer
  4. Inexpensive RF capacitor

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Question #210Basic Electricity and Electronics

Which of the following is one effect of lead inductance in a capacitor used at VHF and above?

  1. Effective capacitance may be reduced ✓ Correct answer
  2. Voltage rating may be reduced
  3. ESR may be reduced
  4. The polarity of the capacitor might become reversed

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Question #211Basic Electricity and Electronics

What is the main disadvantage of using a conventional wire-wound resistor in a resonant circuit?

  1. The resistor's tolerance value would not be adequate for such a circuit
  2. The resistor's inductance could detune the circuit ✓ Correct answer
  3. The resistor could overheat
  4. The resistor's internal capacitance would detune the circuit

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Question #212Basic Electricity and Electronics

What is an advantage of using a ferrite core with a toroidal inductor?

  1. Large values of inductance may be obtained
  2. The magnetic properties of the core may be optimized for a specific range of frequencies
  3. Most of the magnetic field is contained in the core
  4. All of these choices are correct ✓ Correct answer

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Question #213Basic Electricity and Electronics

How should two solenoid inductors be placed so as to minimize their mutual inductance?

  1. In line with their winding axis
  2. With their winding axes parallel to each other
  3. With their winding axes at right angles to each another ✓ Correct answer
  4. Within the same shielded enclosure

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Question #214Basic Electricity and Electronics

Why might it be important to minimize the mutual inductance between two inductors?

  1. To increase the energy transfer between both circuits
  2. To reduce or eliminate unwanted coupling ✓ Correct answer
  3. To reduce conducted emissions
  4. To increase the self-resonant frequency of both inductors

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Question #215Basic Electricity and Electronics

What is an effect of inter-turn capacitance in an inductor?

  1. The magnetic field may become inverted
  2. The inductor may become self resonant at some frequencies ✓ Correct answer
  3. The permeability will increase
  4. The voltage rating may be exceeded

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Question #216Basic Electricity and Electronics

What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes?

  1. Clipper capacitor
  2. Trimmer capacitor
  3. Feedback capacitor
  4. Suppressor capacitor ✓ Correct answer

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Question #217Basic Electricity and Electronics

What is the common name for an inductor used to help smooth the DC output from the rectifier in a conventional power supply?

  1. Back EMF choke
  2. Repulsion coil
  3. Charging inductor
  4. Filter choke ✓ Correct answer

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Question #218Radio Theory and Communication Principles

What type of component is a thermistor?

  1. A resistor that is resistant to changes in value with temperature variations
  2. A device having a controlled change in resistance with temperature variations ✓ Correct answer
  3. A special type of transistor for use at very cold temperatures
  4. A capacitor that changes value with temperature

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Question #219Basic Electricity and Electronics

What is the peak-inverse-voltage rating of a rectifier?

  1. The maximum voltage the rectifier will handle in the conducting direction
  2. 1.4 times the AC frequency
  3. The maximum voltage the rectifier will handle in the non-conducting direction ✓ Correct answer
  4. 2.8 times the AC frequency

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Question #220Basic Electricity and Electronics

What are the two major ratings that must not be exceeded for silicon-diode rectifiers?

  1. Peak inverse voltage; average forward current ✓ Correct answer
  2. Average power; average voltage
  3. Capacitive reactance; avalanche voltage
  4. Peak load impedance; peak voltage

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