Journeyman Electrician Practice Test 16

Question 1: No separate disconnecting means is not required for a motor having power rating 1/4 HP or less.

• True
• False

Question 2: A concealed conductor in electrical wiring means:

• Rendered inaccessible by the structure or finish of the building
• Easily accessible conductor
• Easily accessible conductor
• A conductor having no cover

Question 3: Which of the following is the equation used to calculate the voltage drop in a resistor according to Kirchhoff’s voltage law?

• IR
• I/R
• R/I
• I²R

Question 4: A Electric water heater consumes 16 ampere from a 240 volt branch circuit. what is the minimum ampere rating of branch circuit?

• 20 amperes
• 25 amperes
• 30 amperes
• 16 amperes

Question 5: Load shared by two transformers connected in parallel will depend upon their ......................

• efficiency
• rating
• per unit impedance
• input frequency

Question 6: The slip of induction motor is always ..................

• between zero and unity
• less than zero
• more than unity

Question 7: The overhead conductors between last pole of power company and building structure used for electrical service are termed as …………..

• Service entrance
• Service drop
• Service head
• Service entrance conductors

Question 8: If a time delay fuse is used as short circuit protection of a motor, what is the maximum allowed rating of fuse?

• 125 % of the ampere rating of motor
• 175 % of the ampere rating of motor
• 250 % of the ampere rating of motor

Question 9: What is the minimum distance that a service drop wires should maintain if it is placed above commercial places?

• 10 ft
• 12 ft
• 15 ft
• 18 ft

NEC Reference: NEC 230.24

Question 10: The leakage flux in  a transformer depends upon .........................

• mutual flux
• supply frequency
• load current

Question 11: What percentage of rated current is the distribution transformer no load current?

• 2 to 5%
• 5 to 10%
• 15 to 30%

Question 12: Plug fuses of Edison-base type shall be used for only …………………

• Replacement for existing installations
• External protection to bus bar
• Motor control panel
• Control circuit protection unit

NEC Reference: NEC 240.51(B)

Question 13: The pendant conductors longer than ……….. in length to be twisted together.

• 4 feet
• 3 feet
• 5 feet
• 2 feet

NEC Reference: NEC 410.54(C)

Question 14: Which of the following instrument is used to measure the resistance in the circuit directly?

• Ammeter
• Volt meter
• Watt meter
• Ohm meter

Question 15: If a 30 amperes snap switch is used as disconnecting means of a 3-horse power motor, what shall be the maximum full load current of the motor?

• 24 amperes
• 30 amperes
• 30 amperes
• 28 amperes

NEC Reference: NEC 430.109(C)(2)