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Practice Quiz 2

Quiz by Dr. Kathie Blanco

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20 questions
Show answers
  • Q1
    How many 12 AWG conductors are allowed in an 12.5 in3 round octagonal outlet box?
    7
    2
    6
    5
    30s
  • Q2
    If the diameter of the branch conductor is doubled, the resistance of conductor …….
    increases
    decreases
    doubles
    remains unchanged
    30s
  • Q3
    What is the total voltage drop in a 12 AWG conductor that supply a 18 ampere load which is located 50 feet from the power source? The resistance of conductor is 2 ohm/1000 feet.
    3.6 volts
    18 volts
    36 volts
    1.8 volts
    30s
  • Q4
    The snap switches equipped in the panel boards are rated at 25 amperes, these switches must be protected not in excess of ……………………..
    200
    120
    150
    30
    30s
  • Q5
    What is the minimum percentage rated voltage that a storage battery should supply the emergency load?
    82 1/2 %
    80 %
    87 1/2%
    85 %
    30s
  • Q6
    What is the minimum size THWN branch circuit conductor required for a 20 HP, 480-volt, 3 Phase Induction type squirrel cage motor with nameplate FLI of 26.5 amps?
    6 AWG
    12 AWG
    10 AWG
    8 AWG
    30s
  • Q7
    A 8 AWG conductor is suitable to use at maximum ………… KW supplied with a 120 volts power source.
    30
    6000
    300
    6
    30s
  • Q8
    What is the maximum standard over current device rating used to protect instrument circuits located in a panel board?
    30 amperes
    150 amperes
    200 amperes
    15 amperes
    30s
  • Q9
    The maximum voltage rating of plug fuse is ………….. volts
    120
    36
    240
    420
    30s
  • Q10
    What is the maximum allowable ampacity of a NO.6 AWG copper type THW conductor at an ambient temperature of 75 oC?
    100 amperes
    65 amperes
    50 amperes
    85 amperes
    30s
  • Q11
    The transformer output power is 136 VA, what is transformer input power if the transformer efficiency is 85%?
    144 VA
    160 VA
    115 VA
    136 VA
    30s
  • Q12
    If the resistance of two 12 AWG conductors of 175 feet is 0.4 ohms (0.2 ohms each). What is the power loss in a conductor when the current flow of conductor is 18 amperes?
    550 watts
    488 watts
    129.6 watts
    810 watts
    30s
  • Q13
    EMT shall be securely fastened in place at least every …………..
    8 ft
    10 ft
    15 ft
    5 ft
    30s
  • Q14
    What is the current flow of a 3 kW heat strip connected to 120 volts ac power supply?
    25 amperes
    2.5 amperes
    4 amperes
    40 amperes
    30s
  • Q15
    Pipe electrodes shall have resistance to ground not to exceed …………. ohms when used alone.
    10
    35
    5
    25
    30s

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