NEC Code Questions Practice Test-18

Question 1: An enclosed channel which holds wires,cables or bus-bars is called as:

• raceway
• panel board
• switch board
• receptacle

Question 2: An ohmmeter connected across 240 electric heater shows the reading of 20 ohms. What is the current flow in the electric heater?

• 12 amperes
• 0.083 ohms
• 0.5 ohms
• 8 amperes

Question 3: A residence has an area of 60 feet by 30 feet. Which of the following is the minimum allowable 120 volts , 20 amperes branch circuits required for general lightening?

• 3
• 2
• 4
• 1

Question 4: A 4 AWG THHN conductor is used to connect a 480 Volts, 3 phase 35 KVA transformer to panel board. what is the maximum length of conductor that can be used in which the voltage drop does not cross 3%?  

• 320 feet
• 640 feet
• 720 feet
• 540 feet

NEC Reference: NEC 12.9(Copper)

Question 5: The over load protection must be provided for the motor if it is rated more than ............... Hp.

• 1/8 Hp
• 1/4 Hp
• 1/2 Hp
• 1 Hp

NEC Reference: NEC 430.32(A)

Question 6: What is the maximum continuous load that can be connected to 240 volts 30 amperes branch circuit?

• 24 amperes
• 30 amperes
• 20 amperes
• 26 amperes

NEC Reference: NEC 210.20

Question 7: A incandescent-lamp must not be equipped with medium base if rated more than ............... watts.

• 150 watts
• 200 watts
• 300 watts
• 400 watts

NEC Reference: NEC 410.103

Question 8: In a 14 feet residential hallway, how many minimum number of receptacles are required?

• 2
• 1
• 3
• 4

NEC Reference: NEC 210.52

Question 9: For an electric motor rated not more than ............... horsepower, the branch circuit can server as disconnecting means.

• 1/2 horsepower
• 3/4 horsepower
• 1 horsepower
• 1/8 horsepower

NEC Reference: NEC 422.31(A)

Question 10: What is the minimum volt ampere rating of a 180,000 square foot school?

• 540 KVA
• 320 KVA
• 720 KVA
• 480 KVA

NEC Reference: NEC 220.12