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Question #221Basic Electricity and Electronics

What is the approximate junction threshold voltage of a germanium diode?

  1. 0.1 volt
  2. 0.3 volts ✓ Correct answer
  3. 0.7 volts
  4. 1.0 volts

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Question #222Basic Electricity and Electronics

When two or more diodes are connected in parallel to increase current handling capacity, what is the purpose of the resistor connected in series with each diode?

  1. The resistors ensure the thermal stability of the power supply
  2. The resistors regulate the power supply output voltage
  3. The resistors ensure that one diode doesn't carry most of the current ✓ Correct answer
  4. The resistors act as swamping resistors in the circuit

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Question #223Basic Electricity and Electronics

What is the approximate junction threshold voltage of a silicon diode?

  1. 0.1 volt
  2. 0.3 volts
  3. 0.7 volts ✓ Correct answer
  4. 1.0 volts

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Question #224Basic Electricity and Electronics

Which of the following is an advantage of using a Schottky diode in an RF switching circuit as compared to a standard silicon diode?

  1. Lower capacitance ✓ Correct answer
  2. Lower inductance
  3. Longer switching times
  4. Higher breakdown voltage

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Question #225Basic Electricity and Electronics

What are the stable operating points for a bipolar transistor that is used as a switch in a logic circuit?

  1. Its saturation and cut-off regions ✓ Correct answer
  2. Its active region (between the cut-off and saturation regions)
  3. Between its peak and valley current points
  4. Between its enhancement and deletion modes

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Question #226Basic Electricity and Electronics

Why is it often necessary to insulate the case of a large power transistor?

  1. To increase the beta of the transistor
  2. To improve the power dissipation capability
  3. To reduce stray capacitance
  4. To avoid shorting the collector or drain voltage to ground ✓ Correct answer

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Question #227Radio Theory and Communication Principles

Which of the following describes the construction of a MOSFET?

  1. The gate is formed by a back-biased junction
  2. The gate is separated from the channel with a thin insulating layer ✓ Correct answer
  3. The source is separated from the drain by a thin insulating later
  4. The source is formed by depositing metal on silicon

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Question #228Radio Theory and Communication Principles

Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?

  1. Control grid ✓ Correct answer
  2. Heater
  3. Screen Grid
  4. Suppressor grid

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Question #229Radio Theory and Communication Principles

Which of the following solid state devices is most like a vacuum tube in its general characteristics?

  1. A bipolar transistor
  2. An FET ✓ Correct answer
  3. A Tunnel diode
  4. A varistor

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Question #230Radio Theory and Communication Principles

What is the primary purpose of a screen grid in a vacuum tube?

  1. To reduce grid-to-plate capacitance ✓ Correct answer
  2. To increase efficiency
  3. To increase the high frequency response
  4. To decrease plate resistance

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Question #231Basic Electricity and Electronics

What is an advantage of the low internal resistance of Nickel Cadmium batteries?

  1. Long life
  2. High discharge current ✓ Correct answer
  3. High voltage
  4. Rapid recharge

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Question #232Basic Electricity and Electronics

What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?

  1. 6 volts
  2. 8.5 volts
  3. 10.5 volts ✓ Correct answer
  4. 12 volts

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Question #233Radio Theory and Communication Principles

When is it acceptable to recharge a carbon-zinc primary cell?

  1. As long as the voltage has not been allowed to drop below 1.0 volt
  2. When the cell is kept warm during the recharging period
  3. When a constant current charger is used
  4. Never ✓ Correct answer

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Question #234Radio Theory and Communication Principles

Which of the following is a rechargeable battery?

  1. Carbon-zinc
  2. Silver oxide
  3. Nickel Metal Hydride ✓ Correct answer
  4. Mercury

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Question #235Radio Theory and Communication Principles

What is impedance?

  1. The electric charge stored by a capacitor
  2. The inverse of resistance
  3. The opposition to the flow of current in an AC circuit ✓ Correct answer
  4. The force of repulsion between two similar electric fields

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Question #236Radio Theory and Communication Principles

What is reactance?

  1. Opposition to the flow of direct current caused by resistance
  2. Opposition to the flow of alternating current caused by capacitance or inductance ✓ Correct answer
  3. A property of ideal resistors in AC circuits
  4. A large spark produced at switch contacts when an inductor is de-energized

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Question #237Basic Electricity and Electronics

Which of the following causes opposition to the flow of alternating current in an inductor?

  1. Conductance
  2. Reluctance
  3. Admittance
  4. Reactance ✓ Correct answer

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Question #238Basic Electricity and Electronics

Which of the following causes opposition to the flow of alternating current in a capacitor?

  1. Conductance
  2. Reluctance
  3. Reactance ✓ Correct answer
  4. Admittance

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Question #239Radio Theory and Communication Principles

How does a coil react to AC?

  1. As the frequency of the applied AC increases, the reactance decreases
  2. As the amplitude of the applied AC increases, the reactance increases
  3. As the amplitude of the applied AC increases, the reactance decreases
  4. As the frequency of the applied AC increases, the reactance increases ✓ Correct answer

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Question #240Basic Electricity and Electronics

How does a capacitor react to AC?

  1. As the frequency of the applied AC increases, the reactance decreases ✓ Correct answer
  2. As the frequency of the applied AC increases, the reactance increases
  3. As the amplitude of the applied AC increases, the reactance increases
  4. As the amplitude of the applied AC increases, the reactance decreases

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