Journeyman Electrician Practice Test 5

Question 1: A transformer has an efficiency of 95 percentage which works at 120V , 3.6KVA .if the secondary voltage is 240V then what is it's rated primary current?

• 60 amperes
• 30 amperes
• 20 amperes
• 80 amperes

Question 2: A quick recovery Electric heater is rated at 4500 W and operated at 120 V, What will be the rating of circuit breaker to be used to protect it?

• 50 amperes
• 60 amperes
• 40 amperes
• 70 amperes

NEC Reference: NEC 37.5

Question 3: How many terminals does a potentiometer have?

• 1
• 2
• 3
• 4

Question 4: The sealing compound which seals against passage of gas or vapors through the seal fitting shall not have a melting point of less than ____________ degrees C

• 90⁰ C
• 101⁰ C
• 93⁰ C
• 108⁰ C

NEC Reference: NEC 501.15

Question 5: What is the minimum voltage percentage that a storage battery should supply to emergency load in case of normal power supply failure?

• 85%
• 87 1/2 %
• 92 1/2%
• 90%

NEC Reference: NEC 700.12

Question 6: The demand factor is the ratio of the maximum load demand of a system to the total continuous load.

• TRUE
• False

Question 7: In a metal wire ways the distance between supports shall not exceed ..... feet.

• 10
• 5
• 15
• 8

NEC Reference: NEC 376.30

Question 8: The volume required for NO.14 conductors to be placed in a outlet box is ................. inch³

• 2.0
• 2.25
• 1.50
• 2.50

NEC Reference: NEC 314.16

Question 9: What color bands should be found on a 3201Ω resistor with a tolerance of +-1%?

• orange,red,red,brown
• orange,red,black,brown
• orange,red,red,black
• orange,red,black,red

Question 10: Except AC Generator exciters, all the constant AC voltages should inherently designed with ............................ protection.

• Ground Fault
• Over load
• over voltage
• All the above

NEC Reference: NEC 445.12

Question 11: The resistance of a No 12 conductor is 0.2 ohms with a current flow of 12 amperes. What does it cost per one year for the power loss in the conductor if the electricity cost is 8 cents per KW?

• $20.18
• $18.80
• $ 25.58
• $12.5

NEC Reference: NEC 28.8

Question 12: one KVA is equal to .............

• 1,000 volts
• 1,000 VA
• 100 VA
• 1,000 watts

Question 13: The circuit conductor resistance varies with .....................

• material
• voltage
• current
• power

Question 14: In an Electrical circuit if the current remains the same and resistance increases, the circuit will consume .............

• more power
• less power
• same power

Question 15: A 230 volts electric heater produces ............ when it is supplied by 208 volts?

• less heat
• more heat
• same heat
• none

Question 16: A reliable conductor to ensure the required electrical conductivity between metal parts required to electrically connected is termed as ………………….

• Branch conductor
• Bonding conductor
• Grounding conductor
• Coupling conductor

NEC Reference: NEC 100.1

Question 17: What is the minimum size copper equipment grounding conductor for a 300 – ampere circuit?

• 4 AWG
• 6 AWG
• 8 AWG
• 10 AWG

NEC Reference: NEC 250.122

Question 18: What is the maximum continuous load that can be connected on a 240 volts 30 amperes circuit using two 10 AWG conductors?  

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

NEC Reference: NEC 210.20(A)

Question 19: What is the smallest size copper wire required for a service entrance conductor supplying limited loads of a single branch circuit?

• 12 AWG
• 8 AWG
• 6 AWG
• 10 AWG

NEC Reference: NEC 230.31

Question 20: What is the maximum size fuse allowed to protect 12 AWG THW copper branch conductor?

• 15 amperes
• 20 amperes
• 25 amperes
• 30 amperes

NEC Reference: NEC 240.4(D)(5)