Journeyman Electrician Practice Test 6

Question 1: When an electrical circuit is tested with an ohmmeter, an open circuit is indicated by a reading of .............

• Zero
• infinity
• 600 ohms
• 6000 ohms

Question 2: Four conductors are made up of four different metals with same dimensions, which of the following metal will offer lower resistance for flow of current?

• Gold
• Copper
• Silver
• Aluminum

Question 3: If a DC power supply is supplied to primary of a transformer then .........................

• A small current flows in primary of transformer
• Core losses in transformer will increase
• Leakage reactance of transformer will increase
• Primary winding of transformer may burn out

Question 4: Fuel cell systems should supply emergency load for not less than ........... hours

• 1
• 1 1/2
• 2
• 2 1/2

Question 5: What is the derating factor for 4 to 6 conductors grouped in a raceway or cables?

• 70 %
• 80 %
• 60 %
• 50 %

Question 6: For a residence having a single branch circuit with a limited load what is the minimum size of service is required?

• 10 amperes
• 15 amperes
• 20 amperes
• 25 amperes

NEC Reference: NEC 230.79

Question 7: Class II locations are those that are hazardous because of the presence of ......................

• Flammable gases
• flammable liquids
• combustible dust
• All options are correct

NEC Reference: NEC 500.6

Question 8: Field installed secondary circuit winding for electrical signs of 1000 volts or less shall have a conductor size not less than .....................

• 18 AWG
• 16 AWG
• 14 AWG
• 12 AWG

NEC Reference: NEC 600.3

Question 9: If 30 ampere or less snap switches are equipped in panelboards, they must be protected not in excess of:

• 30 amperes
• 150 amperes
• 200 amperes
• 225 amperes

NEC Reference: NEC 408.36(A)

Question 10: A single motor is driving a generator with overcurrent protection. The same protection can also protect the generator when it is delivering not more than ............. percent of its full load current.

• 125
• 150
• 115
• 170

NEC Reference: NEC 445.12

Question 11: The following lamp holder is approved to be installed in either a damp or wet location?

• One listed for use in wet location
• One listed to use in damp location
• One listed to use in dry location
• All options are correct

NEC Reference: NEC 410.96

Question 12: What must be provided for all working spaces above service equipment, switchboards and panel boards?

• Illumination
• Enclosures or guards
• A protective rod
• A water line

NEC Reference: NEC 110.26(D)

Question 13: The voltage shall not be greater than ............. to supply listed electrical discharge lighting in dwelling units, hotels and motels.

• 120 volts
• 240 volts
• 480 volts
• 277 volts

NEC Reference: NEC 210.6(A)

Question 14: How many number of service disconnects per service are allowed to be grouped in any one location?

• Four
• Five
• Six
• Seven

NEC Reference: NEC 230.71(A)

Question 15: What is the minimum standard rating for fuses and inverse time circuit breakers?

• 10 amperes
• 15 amperes
• 20 amperes
• 25 amperes

NEC Reference: NEC 240.6(A)

Question 16: How many watt-meters are required to measure the power in balanced three phase star connected circuit?

• 1
• 2
• 3
• 4

Question 17: What is the maximum continuous load that can be connected to 240 volts 10 ampere branch circuit?

• 8 amperes
• 10 amperes
• 5 amperes
• 9 amperes

NEC Reference: NEC 210.20

Question 18: 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
• 36 amperes
• 28 amperes

NEC Reference: NEC 430.109(C)(2)

Question 19: If a single phase motor full load current is 30 Amperes, what is the dual element fuze size to be used as motor branch circuit short circuit protection?

• 50 amperes
• 55 amperes
• 60 amperes
• 65 amperes

NEC Reference: NEC 430.52

Question 20: In an electrical circuit, the lamp resistance is 260 ohms and the ammeter indicates 5 mA. What is the power dissipated in the lamp?

• 650mW
• 6.5 mW
• 0.56 W
• 0.8 W

Question 21: Which of the following colors is used to identify the equipment grounding conductor?

• White
• Gray
• Green
• Red

NEC Reference: NEC 250.119

Question 22: In a series circuit, the current through all elements is .............

• Different in each element
• Zero at the last element
• The same in every element
• Highest at the first element

Question 23: According to NEC Article 100, a multi-wire branch circuit is a circuit that has .............

• Three or more separate neutral conductors
• Two or more hot wires sharing one neutral conductor
• Only one hot wire and two neutral conductors
• No neutral conductor

NEC Reference: NEC Article 100

Question 24: A feeder that supplies a continuous load must have an ampacity of not less than what percentage of that load?

• 100%
• 110%
• 125%
• 150%

NEC Reference: NEC 215.2(A)(1)

Question 25: For a motor that does not have a marked service factor of 1.15 or more, the overload protection device must not exceed what percentage of the motor full-load current?

• 140%
• 125%
• 115%
• 100%

NEC Reference: NEC 430.32(A)(1)

Question 26: In a 120/240-volt single-phase 3-wire system, what is the voltage from one hot conductor to the neutral conductor?

• 240 volts
• 208 volts
• 120 volts
• 60 volts

Question 27: When calculating outlet box fill, each current-carrying conductor that runs through or terminates in the box counts as how many conductor volumes?

• ½ volume
• 1 volume
• 2 volumes
• 3 volumes

NEC Reference: NEC 314.16(B)(1)

Question 28: According to NEC Article 100, the term "grounded conductor" refers to a conductor that is .............

• Bare or green insulated
• Used only in motor circuits
• Intentionally connected to ground (earth)
• Connected only to the equipment frame

NEC Reference: NEC Article 100

Question 29: According to NEC 110.9, every overcurrent protection device must have an interrupting rating sufficient to ...

• Carry 125% of the load current continuously
• Interrupt the maximum available fault current at that location
• Open the circuit within 1 second under normal load
• Handle only the rated load current

NEC Reference: NEC 110.9

Question 30: Kirchhoff's Current Law states that at any junction in a circuit, the total current entering the junction is ...

• Always greater than the current leaving
• Equal to the total current leaving
• Always less than the current leaving
• Zero regardless of the number of branches