NEC Code Questions Practice Test-17

Question 1: What is the minimum working space that should be provided for switch boards and panel boards?

• 6 1/2 feet
• 8 1/2 feet
• 4 1/2 feet
• 2 1/2 feet

NEC Reference: NEC 110.26(A)(3)

Question 2: Which of the following equation is suitable to find the voltage drop in the circuit?

• VD = IR
• VD = I / R
• VD = P / I
• VD = I ² R

Question 3: What is the wattage of the 120 volts single phase motor with a resistance of 20 ohms?

• 720 Watts
• 520 Watts
• 2400 watts
• 6 watts

Question 4: Over current devices must not be located on ..............

• Over the steps of stairway
• Above the panel board
• Bath Rooms
• Wet areas

Question 5: The primary current rating of a motor generator arc welder is 30 A with a duty cycle of 30 %? what is the minimum size branch circuit conductor for welder?

• 12 AWG
• 10 AWG
• 14 AWG
• 8 AWG

Question 6: The maximum over current protection used for resistance type heating elements in electric space-heating equipment?

• 60 amperes
• 40 amperes
• 70 amperes
• 20 amperes

NEC Reference: NEC 424.22(B)

Question 7: For a single family dwelling unit , what is the minimum allowable rating of a 3 wire service entrance conductors?

• 100 amperes
• 150 amperes
• 200 amperes
• 180 amperes

NEC Reference: NEC 230.42(B)

Question 8: An electric heater with a resistance of 18 ohms which draws a current of 7 amps. what is the minimum wattage of electric heater?

• 882 watts.
• 126 watts
• 723 watts
• 184 watts

Question 9: What is the maximum branch circuit load for a 10 kW single electric range in a dwelling unit?

• 8 kW
• 10 KW
• 7 KW
• 6 KW

NEC Reference: NEC 220.555

Question 10: Which of the following must be provided near electronic equipment which are exposed to physical damage?

• warning signs
• working space
• enclosures or gaurds
• sufficient head room

NEC Reference: NEC 110.27(B)