Engineering Quiz: A Basic Electrical Theory Assessment Test

100 Questions | Total Attempts: 3154

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Engineering Quiz: A Basic Electrical Theory Assessment Test

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Questions and Answers
  • 1. 
    • A. 

      It can be transformed.

    • B. 

      It develops eddy currents.

    • C. 

      It can interfere with communications lines.

    • D. 

      It is suitable for charging batteries.

  • 2. 
    • A. 

      For every 20 turns in the primary, there is one turn in the secondary.

    • B. 

      The primary voltage is 20 times greater than that of the secondary.

    • C. 

      For every 20 rotations in the secondary, there is one rotation in the primary.

    • D. 

      None of the above

  • 3. 
    If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following:
    • A. 

      Ventilated

    • B. 

      Explosion proof

    • C. 

      Explosion resistant

    • D. 

      Fire proof

  • 4. 
    The output of a 3-phase transformer is measured in which of the following units:
    • A. 

      Volts

    • B. 

      Amperes

    • C. 

      Volt-amps

    • D. 

      Watts

  • 5. 
    In order to change the rotation of a DC series motor, which of the following must be done:
    • A. 

      The motor must be converted to AC.

    • B. 

      F1 and F2 must be reversed.

    • C. 

      The capacitor leads must be reversed.

    • D. 

      The frequency must be altered.

  • 6. 
    Bonding does which of the following:
    • A. 

      Provides electrical continuity

    • B. 

      Regulates the voltage

    • C. 

      Controls the load on the system installation

    • D. 

      All of the above

  • 7. 
    A meter used to measure both AC and DC voltage and current is known as which of the following:
    • A. 

      An ohms meter

    • B. 

      A multimeter

    • C. 

      A resistance meter

    • D. 

      None of the above

  • 8. 
    Which of the following materials is used on conduits inside and outside of a box:
    • A. 

      Bushings

    • B. 

      Couplings

    • C. 

      Lock nuts

    • D. 

      All of the above

  • 9. 
    If a transformer has a voltage step-down from 117 volts to 6 volts then the ratio of the transformer is equal to which of the following:
    • A. 

      19, 5 :1

    • B. 

      1 :19, 5

    • C. 

      180 :1

    • D. 

      3 :1

  • 10. 
    If the power factor of a circuit is increased, then which of the following occurs:
    • A. 

      The active power is increased

    • B. 

      The reactive power is decreased

    • C. 

      Both of the above

    • D. 

      None of the above

  • 11. 
    In a 3Ø circuit, how many electrical degrees separate each phase:
    • A. 

      3

    • B. 

      120

    • C. 

      180

    • D. 

      360

  • 12. 
    Ground fault protection for personnel on a 120 volt single-phase circuit is based on which of the following:
    • A. 

      Ungrounded current between conductors

    • B. 

      Unbalanced current between the grounded and ungrounded conductor

    • C. 

      Overload in the current carrying conductor

    • D. 

      Excessive voltage in the grounding conductor

  • 13. 
    Electrical appliances shall be installed in parallel in order to make the operation of each appliance in- dependent of the others.
    • A. 

      True

    • B. 

      False

  • 14. 
    In order to calculate watt hours, which of the following formulas must be used:
    • A. 

      E x I x T²

    • B. 

      Amps/Volts

    • C. 

      E x I x T

    • D. 

      24 /(E x I x T )

  • 15. 
    The peak value of AC voltage determines the breakdown voltage of insulation.
    • A. 

      True

    • B. 

      False

  • 16. 
    The efficiency of electrical equipment is determined by which of the following:
    • A. 

      The amount of friction present

    • B. 

      The motor speed divided by the input power

    • C. 

      The power output divided by the input

    • D. 

      None of the above

  • 17. 
    Inductance and capacitance are not considerations in a DC current for which of the following reasons:
    • A. 

      DC supply has no frequency

    • B. 

      DC supply carries power equally

    • C. 

      Both of the above

    • D. 

      None of the above

  • 18. 
    Two transmission wires create a corona when which of the following exists:
    • A. 

      The wires have a high potential difference

    • B. 

      The wires are installed overlapping or too close together

    • C. 

      The wires are spaced too far apart

    • D. 

      None of the above

  • 19. 
    Rearranging  the control components in an electrical diagram in order to simplify tracing of a circuit is an example of a schematic diagram.
    • A. 

      True

    • B. 

      False

  • 20. 
    In a coil, the higher the level of self-inductance:
    • A. 

      The lower the level of resistance will be

    • B. 

      The longer the delay will be in establishing current through it

    • C. 

      The greater the level of flux produced will be

    • D. 

      None of the above

  • 21. 
    A negative charge will do which of the following: 1.      I.    Interact with negative charges 2.      II.   Interact with positive charges 3.      III. Cause a short in a positive system
    • A. 

      I & III

    • B. 

      I & II

    • C. 

      I only

    • D. 

      All of the above

  • 22. 
    If a circuit breaker is installed vertically and the handle is flipped up, then the circuit breaker will be which of the following:
    • A. 

      Off

    • B. 

      Unable to operate properly

    • C. 

      On

    • D. 

      Locked in place

  • 23. 
    A dielectric electrical element is which of the following:
    • A. 

      A capacitor

    • B. 

      A grounding conductor

    • C. 

      An insulator

    • D. 

      None of the above

  • 24. 
    The electrical property of conductors that allows them to oppose the free flow of current traveling over them is measured in which of the following:
    • A. 

      Amperes

    • B. 

      Ohms

    • C. 

      Volts

    • D. 

      Watts

  • 25. 
    Two equally valued resistors in series have a total resistance of which of the following:
    • A. 

      Twice as much as one of the resistors

    • B. 

      The sum of one

    • C. 

      The difference between each resistance

    • D. 

      None of the above