Topic G6A Quick Review Audio


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
  4. 12 volts


What is an advantage of the low internal resistance of nickel-cadmium batteries?

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


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

  1. 0.1 volt
  2. 0.3 volts
  3. 0.7 volts
  4. 1.0 volts


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

  1. Tight tolerance
  2. Much less leakage than any other type
  3. High capacitance for a given volume
  4. Inexpensive RF capacitor


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

  1. 0.1 volt
  2. 0.3 volts
  3. 0.7 volts
  4. 1.0 volts


Which of the following is a reason not to use wire-wound resistors in an RF circuit?

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


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

  1. Its saturation and cutoff regions
  2. Its active region (between the cutoff and saturation regions)
  3. Its peak and valley current points
  4. Its enhancement and depletion modes


What is an advantage of using a ferrite core 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 these choices are correct


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
  3. The source is separated from the drain by a thin insulating layer
  4. The source is formed by depositing metal on silicon


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

  1. Control grid
  2. Heater
  3. Screen grid
  4. Trigger electrode


What happens when an inductor is operated above its self-resonant frequency?

  1. Its reactance increases
  2. Harmonics are generated
  3. It becomes capacitive
  4. Catastrophic failure is likely


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

  1. To reduce grid-to-plate capacitance
  2. To increase efficiency
  3. To increase the control grid resistance
  4. To decrease plate resistance


Why is the polarity of applied voltages important for polarized capacitors?

  1. Incorrect polarity can cause the capacitor to short-circuit
  2. Reverse voltages can destroy the dielectric layer of an electrolytic capacitor
  3. The capacitor could overheat and explode
  4. All these choices are correct


Which of the following is an advantage of ceramic capacitors as compared to other types of capacitors?

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