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Question #281Radio Theory and Communication Principles

Which of the following is a characteristic of a Class A amplifier?

  1. Low standby power
  2. High Efficiency
  3. No need for bias
  4. Low distortion ✓ Correct answer

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Question #282Radio Theory and Communication Principles

For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?

  1. SSB
  2. CW ✓ Correct answer
  3. AM
  4. All of these answers are correct

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Question #283Radio Theory and Communication Principles

Which of the following is an advantage of a Class C amplifier?

  1. High efficiency ✓ Correct answer
  2. Linear operation
  3. No need for tuned circuits
  4. All of these answers are correct

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Question #284Radio Theory and Communication Principles

How is the efficiency of an RF power amplifier determined?

  1. Divide the DC input power by the DC output power
  2. Divide the RF output power by the DC input power ✓ Correct answer
  3. Multiply the RF input power by the reciprocal of the RF output power
  4. Add the RF input power to the DC output power

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Question #285Radio Theory and Communication Principles

Which of the following describes a linear amplifier?

  1. Any RF power amplifier used in conjunction with an amateur transceiver
  2. An amplifier whose output preserves the input waveform ✓ Correct answer
  3. A Class C high efficiency amplifier
  4. An amplifier used as a frequency multiplier

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Question #286Basic Electricity and Electronics

A voltage will influence current only if the circuit is:

  1. open
  2. insulated
  3. high resistance
  4. closed ✓ Correct answer

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Question #287Radio Theory and Communication Principles

Which component stores energy in electric field.

  1. resistor
  2. capacitor ✓ Correct answer
  3. inductor
  4. transistor

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Question #288Radio Theory and Communication Principles

Which element stores energy in magnetic field.

  1. resistor
  2. capacitor
  3. inductor ✓ Correct answer
  4. transistor

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Question #289Radio Theory and Communication Principles

Which battery is non chargeable.

  1. Lead acid
  2. nickel cadmium
  3. lithium ion
  4. zinc carbon ✓ Correct answer

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Question #290Basic Electricity and Electronics

The color band on the right side of a color coded resistor represents

  1. First digit
  2. Decimal multiplier
  3. Percentage tolerance ✓ Correct answer
  4. rating

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Question #291Radio Equipment, Measurements and Safety

A voltmeter is used:

  1. to measure current
  2. in series with the circuit
  3. in parallel with the circuit ✓ Correct answer
  4. to measure coulombs

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Question #292Basic Electricity and Electronics

If the current in a circuit equals 0 A, it is likely that the

  1. voltage is too high
  2. resistance is too low
  3. circuit has a short
  4. circuit is open ✓ Correct answer

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Question #293Radio Theory and Communication Principles

One coulomb passing a point in one second is one:

  1. ampere ✓ Correct answer
  2. volt
  3. ohm
  4. charge

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Question #294Radio Theory and Communication Principles

A switch is a device that:

  1. short circuits complex circuits
  2. holds a fuse
  3. has double poles
  4. opens or completes a current path ✓ Correct answer

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Question #295Radio Theory and Communication Principles

The term used to designate electrical pressure is:

  1. voltage ✓ Correct answer
  2. current
  3. resistance
  4. conductance

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Question #296Radio Theory and Communication Principles

_______ are materials in which electric charges do not move easily.

  1. Insulators ✓ Correct answer
  2. Conductors
  3. Circuits
  4. Metals

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Question #297Basic Electricity and Electronics

Kirchoff_’s current law is applicable only to

  1. Electronic circuits
  2. Junction in a network ✓ Correct answer
  3. electric circuits
  4. None of these

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Question #298Radio Theory and Communication Principles

____can prevent damage caused to buildings by lightning strikes.

  1. Insulating
  2. Conducting
  3. Grounding ✓ Correct answer
  4. Charging

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Question #299Radio Theory and Communication Principles

The measure of how difficult it is for electrons to flow in an object is called the _______.

  1. electric circuit
  2. electric resistance ✓ Correct answer
  3. magnetic domain
  4. electric field

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Question #300Basic Electricity and Electronics

When a portable radio is playing, the current in the radio is 0.3 A. If the resistance of the radio is 30.0 Ohm, what is the voltage supplied by the radio battery?

  1. 12 V
  2. 9 V ✓ Correct answer
  3. 6 V
  4. 15 V

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