Journeyman Electrician Practice Test 13

Question 1: A Differential relay measures the vector difference between .........................

• two voltages
• two or more similar electrical quantities
• differential of two impedances

Question 2: If a motor is connected on 240 Volts electrical circuit, which of the following disconnecting switch is used?

• single pole switch
• 2 -pole switch

Question 3: For a limited load having only one 2-wire branch circuit, what is the acceptable service equipment is required?

• A 30 amp Service equipment supplied by two No.12 Copper
• A 50 amp Service equipment supplied by two No.12 Copper
• A 15 amp Service equipment supplied by two No.12 Copper
• A 15 amp Service equipment supplied by two No.12 Aluminum

Question 4: A Single family house that has a initial computed load of 10 kW or more should have a minimum ..................... amp 120/240 - volt 3-wire service supplied by three wires.

• 100
• 30
• 60
• 15

Question 5: The corona starting voltage can be increased by:

• decreasing the dia of conductors
• decreasing the spacing between the conductors
• increasing the spacing between conductors and their diameter

Question 6: A 2-Pole Breaker occupies twice as the space of a single pole breaker.

• True
• False

Question 7: Which is the suitable breaker to protect a 240 volt circuit?

• Single Pole Breaker
• 2 Pole (Double Pole) Breaker

Question 8: One Horse Power (hp) is equal to ..........

• 746 watts
• 766 watts
• 764 watts

Question 9: When the motor is overloaded, its .....................

• speed drops
• speed increases

Question 10: A 100 W fan has a normal frequency of 60 Hz , at 120 Hz supply the power drawn will be:

• 400 W
• 200 W
• 300 W
• 100 W

Question 11: Which of the following circuits shall not be connected to system containing trolley wires?

• Circuits for lightening
• Grounding wires
• Ungrounded trolley wires
• Bonding wires

NEC Reference: NEC 110.19

Question 12: The branch circuits having rating in excess of ……………………. shall require heavy duty type lamp holders.

• 20 amperes
• 35 amperes
• 45 amperes
• 15 amperes

NEC Reference: NEC 210.21(A)

Question 13: What is the smallest aluminum wire size allowed for service entrance conductors?

• 6 AWG
• 8 AWG
• 10 AWG
• 12 AWG

NEC Reference: NEC 230.31(B)

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: In which of the following the panel boards must be enclosed?

• Cut boxes
• Cabinets
• All options are correct
• Enclosures designed for the purpose

NEC Reference: NEC 408.38