Journeyman Electrician Practice Test 29

Question 1: The minimum working depth ................. shall be required  at electrical equipment rated at 601 volts where it has one side exposed live part and grounded parts at anther side of working space

• 3 ft
• 4 ft
• 5 ft
• 6 ft

NEC Reference: NEC 110.34(1)

Question 2: The guard ring must be in contact to the earth and shall be buried at a depth from the earth's surface not less than ......................

• 3 feet
• 2 feet
• 1 1/2 feet
• 2 1/2 feet

NEC Reference: NEC 250.53(F)

Question 3: Type AC Cables shall not be permitted to use in the following locations?

• damp and wet locations
• concealed locations
• exposed locations
• dry locations

NEC Reference: NEC 310.22

Question 4: Which of the following is the maximum phase to phase voltage of yard and pier distribution system?

• 120 volts
• 240 volts
• 600 volts
• 480 volts

NEC Reference: NEC 555.4

Question 5: The unit of power factor is:

• VA
• Watts
• no unit
• ampere

Question 6: The turns ratio of the transformer is 10:4 which of the following is the primary voltage of the transformer if the rated secondary is 120 volts.

• 300 volts
• 48 volts
• 1200 volts
• 480 volts

Question 7: If the supply frequency is doubled, the capacitive reactance of the circuit ..............

• will be reduces to half
• will be doubled
• remains same

Question 8: Which of the following is the maximum permissible current in 400 watts , 1 ohm resistor?

• 20 amperes
• 40 amperes
• 2 amperes
• 4 amperes

Question 9: The three phase motor should have overload protection device in each phase.

• True
• False

NEC Reference: NEC 430.37

Question 10: The ampacity of the tap conductors who's length is 25 ft long shall be less than .................... of the over current device protecting feeder conductors.

• 1/3
• 1/2
• 1/4
• 3/4

NEC Reference: NEC 240.21