2A672 Volume 1 Ure Questions

84 Questions | Total Attempts: 2295

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2A672 Quizzes & Trivia

Unit Review Questions from CDC 2A672 Volume 1


Questions and Answers
  • 1. 
    What is the simplest form of matter?
    • A. 

      Element

    • B. 

      Mixture

    • C. 

      Electrons

    • D. 

      Compound

  • 2. 
    In an atom, what electrons contain the most energy?
    • A. 

      The energy is shared equally by all electrons

    • B. 

      Orbiting electrons

    • C. 

      Valence electrons

    • D. 

      K shell electrons

  • 3. 
    Atoms having more than four electrons, but less than eight are known as
    • A. 

      Insulators

    • B. 

      Conductors

    • C. 

      Stable atoms

    • D. 

      Semiconductors

  • 4. 
    The electrostatic fields around a positive ion move
    • A. 

      Inward

    • B. 

      Outward

    • C. 

      Inward, then outward

    • D. 

      Outward, then inward

  • 5. 
    What are factors that affect the resistance of a material?
    • A. 

      Area, weight, and state of material

    • B. 

      Area, temperature, and type of material

    • C. 

      Temperature, weight, and state of material

    • D. 

      Temperature, type of material, and state of material

  • 6. 
    What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?
    • A. 

      40 ohms

    • B. 

      20 ohms

    • C. 

      10 ohms

    • D. 

      0.5 ohms

  • 7. 
    Convert 500 milliamps to standard amperage.
    • A. 

      .005 amps

    • B. 

      .05 amps

    • C. 

      .5 amps

    • D. 

      50 amps

  • 8. 
    In a series-parallel circuit, find RT if series resistor R1 = 7 ohms, and parallel resistors R2 and R3 = 8 ohms.
    • A. 

      23 ohms

    • B. 

      15 ohms

    • C. 

      11 ohms

    • D. 

      8 ohms

  • 9. 
    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 Ohms'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

  • 10. 
    What is the difference between and open and a short?
    • A. 

      An open causes resistance to decrease; a short causes resistance to increase

    • B. 

      Excessive current flow in an open circuit; no current flow in a shorted component

    • C. 

      No current flow in an open circuit; excessive current flow in a shorted component

    • D. 

      Minimum voltage development across the open component; maximum voltage development across the shorted component

  • 11. 
    Voltage induced into a conductor by the expanding and collapsing of a magnetic field is
    • A. 

      Magnetism

    • B. 

      Reluctance

    • C. 

      Direct current

    • D. 

      Electromagnetic induction

  • 12. 
    In an inductor, what happens to the magnetic lines of force if the diameter of the core is increased in size?
    • A. 

      Permeability increases

    • B. 

      Magnetic field decreases

    • C. 

      Induction of the coil increases

    • D. 

      Induction of the coil decreases

  • 13. 
    What is the basic principle of operation for transformers?
    • A. 

      Mutual induction

    • B. 

      Magnetic induction

    • C. 

      Counterelectromotive force

    • D. 

      Primary and secondary induction

  • 14. 
    What type of transformer contains more turns in the primary winding than in the secondary winding?
    • A. 

      Current

    • B. 

      Step up

    • C. 

      Rectifier

    • D. 

      Step down

  • 15. 
    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

  • 16. 
    What statement best describes a capacitive circuit?
    • A. 

      Current leads applied voltage by 90 degrees

    • B. 

      Applied voltage leads current by 90 degrees

    • C. 

      Has the ability to conduct in one direction and not in the other

    • D. 

      Has the ability to conduct in all directions when gated or discharged

  • 17. 
    How many electrons does the valance band of an intrinsic semiconductor have?
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      6

  • 18. 
    What are the minority carriers in P-type material?
    • A. 

      Holes

    • B. 

      Protons

    • C. 

      Neutrons

    • D. 

      Electrons

  • 19. 
    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

  • 20. 
    A junction diode has how many PN junction(s)?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 21. 
    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

  • 22. 
    If a zener diode is installed in the forward bias mode in a circuit, it acts as a
    • A. 

      Regular diode

    • B. 

      Spike protector

    • C. 

      Voltage reference

    • D. 

      Voltage regulator

  • 23. 
    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

  • 24. 
    If a schematic diagram doesn't list a reference for the zener diode, the diode is probably being used as a
    • A. 

      Reference

    • B. 

      Normal diode

    • C. 

      Spike protector

    • D. 

      Voltage regulator

  • 25. 
    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

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