NEC Code Questions Practice Test-12

Question 1: If a 115 volts load is connected to 120 v source. what is the minimum voltage that should be supplied to load as recommended by NEC?

• 114 volts
• 120 volts
• 115 volts
• 118 volts

Question 2: What is the receptacle calculated load for a 18000 square feet commercial property which contains one hundred twenty 15 A and 20 A 120 receptacles?

• 15800 VA
• 18000 VA
• 16800 VA
• 21500 VA

NEC Reference: NEC 220.14(1)

Question 3: In no case the rating of short  circuit ground fault protective device for a single motor compressor should not exceed ..... percentage of the motor.

• 175 %
• 225 %
• 220 %
• 150 %

NEC Reference: NEC 440.22(A)

Question 4: The service disconnect for a mobile home should be located not less than ............. feet above platform.

• 1
• 2
• 1/2
• 3

NEC Reference: NEC 550.32(F)

Question 5: What is the minimum feeder or service load for cloth dryers in a dwelling unit?

• 5000 watts
• 2800 watts
• 4500 watts
• 6500 watts

NEC Reference: NEC 220.54

Question 6: A 4000 watts electric oven is connected to a 480 volts circuit. What is the resistance of heating element?

• 57.6 ohms
• 78.6 ohms
• 82 ohms
• 48

NEC Reference: NEC 57.6

Question 7: In a three phase balanced 4-wire system, the current in the neutral conductor ...............................

• is same as un-grounded conductors
• is higher than other conductors
• is lower than other conductors
• will not flow as the circuit is balanced

Question 8: Which of the following conductors need over current protection on a residential electric service?

• un-grounded conductor
• grounded conductor
• neutral conductor
• equipment grounding conductor

NEC Reference: NEC 240.15

Question 9: In class I Division 1 location, All fixed boxes and joints should be made ..............

• explosion proof
• water proof
• dust proof
• fire proof

NEC Reference: NEC 500.7(A)