Journeyman Electrician Practice Test 6

Question 1: 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 2: A singe motor is driving 40 volts generator having an over current protection. if the same can also protect the generator when the generator is delivering not more than ...................... percentage of its full load current

• 125
• 150
• 115
• 170

NEC Reference: NEC 445.12

Question 3: What is the derating factor for 4 to 6 conductors grouped in a raceway or cables?

• 70 %
• 80 %
• 60 %
• 50 %

Question 4: 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 5: 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 6: 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 7: In a Electrical circuit , the lamp resistance is 260 ohms and the ammeter in circuit indicates 5mA. What is the power dissipated in lamp?

• 650mW
• 6.5 mW
• 0.56 W
• 0.8 W

Question 8: Fuel cell systems should supply emergency load for not less than ........... hours

• 1
• 1 1/2
• 2
• 2 1/2

Question 9: 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 10: When an electrical circuit tested with ohmmeter, a open circuit is indicated by a reading of ………………….

• Zero
• infinity
• 600 ohms
• 6000 ohms

Question 11: 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 12: 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 13: How many watt-meters are required to measure the power in balanced three phase star connected circuit?

• 1
• 2
• 3
• 4

Question 14: 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 15: 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 16: 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 17: 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 18: The voltage shall not be greater than ………….. to supply listed electrical discharge lightening in dwelling units, hotels and motels?

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

NEC Reference: NEC 210.6(A)

Question 19: 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 20: What is the minimum standard rating for fuses and inverse time circuit breakers?

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

NEC Reference: NEC 260.6