Age 2A672 (Vol 1)

88 Questions | Total Attempts: 202

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2A672 Quizzes & Trivia

Questions and Answers
  • 1. 
    (020) What signal powers the regulator card output pulse sent to the exciter field of the B809A generator?
    • A. 

      28.5 volts direct current (VDC).

    • B. 

      110 VDC.

    • C. 

      115 volts alternating current (VAC)

    • D. 

      200 VAC.

  • 2. 
    (011) The circuit in the bipolar transistor that carries 5 percent of the current flow is the
    • A. 

      Emitter-collector circuit.

    • B. 

      Control circuit.

    • C. 

      Base circuit.

    • D. 

      Load circuit.

  • 3. 
    (32) Refer to foldout 7. You are testing an alternating current (AC) generator and find B phase on the A/M24T-8 load bank isn't working. What is the probable cause of this trouble?
    • A. 

      CB1.

    • B. 

      CR1.

    • C. 

      S56.

    • D. 

      S1.

  • 4. 
    (002) In a series-parallel circuit, the series current at I1 = 9 amps; in the two parallel branches, I2 = 5 amps; and the value of I3 is not listed.  Use Ohm's law to find the value of I3 and IT.
    • A. 

      I3 = 5 amps and IT = 14 amps.

    • B. 

      I3 = 4 amps and IT = 9 amps.

    • C. 

      I3 = 4 amps and IT = 18 amps..

    • D. 

      Not enough information to solve.

  • 5. 
    (003) In an inductive circuit, what is meant by current lags voltage by 90 degrees?
    • A. 

      Current is maximum when voltage is zero; voltage is maximum when current is zero.

    • B. 

      Current is zero when voltage is zero; voltage is maximum when current is maximum.

    • C. 

      If current decreases, voltage aids the decrease.

    • D. 

      If current increases, voltage aids the increase.

  • 6. 
    (004) What is the basic principle of operation for transformers?
    • A. 

      Mutual induction.

    • B. 

      Magnetic induction.

    • C. 

      Counterelectromotive force.

    • D. 

      Primary and secondary induction.

  • 7. 
    (011) If the arrow in a bipolar transistor is pointing away from the base, what type of transistor is it?
    • A. 

      N-type.

    • B. 

      P-type.

    • C. 

      NPN.

    • D. 

      PNP.

  • 8. 
    (013) What controls the firing time of the unijunction transistor (UJT)?
    • A. 

      Intrinsic standoff ratio.

    • B. 

      Resistance in the circuit.

    • C. 

      Capacitance in the circuit.

    • D. 

      Resistance and capacitance in the circuit.

  • 9. 
    (005) If the size of the plates of a capacitor is increased, how is capacitance affected?
    • A. 

      Capacitance increases.

    • B. 

      Capacitance decreases.

    • C. 

      Electrons are distorted and scattered.

    • D. 

      Electrostatic force between the plates decreases.

  • 10. 
    (010) In order to turn off a silicone-controlled rectifier (SCR), the current must drop below the
    • A. 

      Trigger current.

    • B. 

      Holding current.

    • C. 

      Variable current.

    • D. 

      Breakdown current.

  • 11. 
    (005) In what type of circuit(s) does a capacitor oppose any change in voltage?
    • A. 

      Alternating current (AC) and direct current (DC)

    • B. 

      Pulsating DC.

    • C. 

      AC.

    • D. 

      Pure DC.

  • 12. 
    (006) What are the minority carriers in P-type material?
    • A. 

      Neutrons.

    • B. 

      Holes.

    • C. 

      Electrons.

    • D. 

      Protons.

  • 13. 
    (007) The area of a semiconductor where P-type material is joined to N-type material is known as
    • A. 

      Dielectric region.

    • B. 

      Depletion region.

    • C. 

      Depletion field.

    • D. 

      PN region.

  • 14. 
    (007) If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is
    • A. 

      Reverse biased.

    • B. 

      Turned on.

    • C. 

      Forward biased.

    • D. 

      Not allowing current to flow.

  • 15. 
    (008) In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)?
    • A. 

      4.

    • B. 

      3.

    • C. 

      2.

    • D. 

      1.

  • 16. 
    (020) What condition is sensed by the direct current (DC) card on the B809A generator set?
    • A. 

      Low fuel.

    • B. 

      Overtemperature.

    • C. 

      Under frequency.

    • D. 

      Overfrequency.

  • 17. 
    (009) How is a zener diode connected in a circuit to regulate voltage?
    • A. 

      In parallel to the load.

    • B. 

      In series with the load.

    • C. 

      In parallel to the resistor.

    • D. 

      In series with the resistor.

  • 18. 
    (004) What transformer winding acts as a conductor and provides the path into which the voltage is induced?
    • A. 

      Field.

    • B. 

      Primary.

    • C. 

      Secondary.

    • D. 

      Stationary.

  • 19. 
    (009) How is the zener diode connected in a circuit to protect the load?
    • A. 

      In parallel to the resistor.

    • B. 

      In series with the load.

    • C. 

      In parallel to the load.

    • D. 

      Forward biased.

  • 20. 
    (090) What is the primary use of a silicon-controlled rectifier (SCR)?
    • A. 

      Electronic switch.

    • B. 

      Voltage regulator.

    • C. 

      Circuit amplifier.

    • D. 

      Spike protector.

  • 21. 
    (001) The force required to move free electrons through a conductor is known as
    • A. 

      Current.

    • B. 

      Negative charge.

    • C. 

      Voltage.

    • D. 

      Electrostatic force.

  • 22. 
    (012) What happens if the emitter-base (E-B) current is increased in a transistor amplifier?
    • A. 

      Resistance decreases and current through the load circuit decreases.

    • B. 

      Resistance increases and current flow decreases.

    • C. 

      Current decreases through the emitter-collector (E-C) circuit.

    • D. 

      Current increases through the E-C circuit.

  • 23. 
    (010) The silicon-controlled rectifier (SCR) has how many layers?
    • A. 

      1.

    • B. 

      2.

    • C. 

      3.

    • D. 

      4.

  • 24. 
    (011) What is the major difference between an NPN transistor and a PNP transistor?
    • A. 

      A PNP transistor can only be used as a regulator.

    • B. 

      An NPN transistor can only be used as a switch.

    • C. 

      Direction of current flow.

    • D. 

      Number of junctions.

  • 25. 
    (001) In an atom, what electrons contain the most energy?
    • A. 

      Valence electrons.

    • B. 

      Orbiting electrons.

    • C. 

      K shell electrons.

    • D. 

      The energy is shared equally by all electrons.

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