Journeyman Electrician Practice Test-5
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Question 1 of 20
1. Question
1 pointsA 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?
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Solution:
Primary current = 3600/120 = 30 amperes -
Question 2 of 20
2. Question
1 pointsA 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?
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The ampere current drawn by electric heater = power / supply voltage = 4500/120 = 37.5 amperes
The circuit breaker rating should be 150% full load current
150% * 37.5 = 56.5 amperes. The nearest one is 60 amperes. -
Question 3 of 20
3. Question
1 pointsHow many terminals does a potentiometer have?
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Third terminal to change the resistance
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Question 4 of 20
4. Question
1 pointsThe 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
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Refer:
501.15[C][2] -
Question 5 of 20
5. Question
1 pointsWhat is the minimum voltage percentage that a storage battery should supply to emergency load in case of normal power supply failure?
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Refer: NEC 700.12 [A]
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Question 6 of 20
6. Question
1 pointsThe demand factor is the ratio of the maximum load demand of a system to the total continuous load.
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Refer : NEC 100 [Definitions]
Demand factor = Maximum load demand / Total connected load
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Question 7 of 20
7. Question
1 pointsIn a metal wire ways the distance between supports shall not exceed ….. feet.
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Refer : NEC 376.30[A]
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Question 8 of 20
8. Question
1 pointsThe volume required for NO.14 conductors to be placed in a outlet box is …………….. inch3
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Refer: NEC Table 314.16[B]
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Question 9 of 20
9. Question
1 pointsWhat color bands should be found on a 3201Ω resistor with a tolerance of +-1%?
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3 (orange)
2 (red)
10(2) = red
tolerance = brown -
Question 10 of 20
10. Question
1 pointsExcept AC Generator exciters, all the constant AC voltages should inherently designed with ………………………. protection.
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Refer : NEC 445.12[A]
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Question 11 of 20
11. Question
1 pointsThe 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?
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The power loss in conductor = I2 R = (12 * 12 ) * 0.2 = 28.8 watts / hour
Total cost of power loss for year = (28.8 * 24 * 365 * 8 ) / 1000 = 2018.3 cents = $ 20.18
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Question 12 of 20
12. Question
1 pointsone KVA is equal to ………….
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Question 13 of 20
13. Question
1 pointsThe circuit conductor resistance varies with …………………
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Question 14 of 20
14. Question
1 pointsIn an Electrical circuit if the current remains the same and resistance increases, the circuit will consume ………….
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Question 15 of 20
15. Question
1 pointsA 230 volts electric heater produces ………… when it is supplied by 208 volts?
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Question 16 of 20
16. Question
1 pointsA reliable conductor to ensure the required electrical conductivity between metal parts required to electrically connected is termed as ………………….
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Refer NEC 100.1 General Definitions
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Question 17 of 20
17. Question
1 pointsWhat is the minimum size copper equipment grounding conductor for a 300 – ampere circuit?
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Refer: NEC Table 250.122
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Question 18 of 20
18. Question
1 pointsWhat is the maximum continuous load that can be connected on a 240 volts 30 amperes circuit using two 10 AWG conductors?
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Refer : NEC 210.20(A)
Circuit conductors should be rated at 125% connected load which is continuous.
Refer NEC Table 310.15(B)(16)
8 AWG conductors maximum ampacity is 30 amperes
The maximum continuous connected load = 30 / 125% = 24 amperes
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Question 19 of 20
19. Question
1 pointsWhat is the smallest size copper wire required for a service entrance conductor supplying limited loads of a single branch circuit?
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Refer: NEC 230.31 ( B)
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Question 20 of 20
20. Question
1 pointsWhat is the maximum size fuse allowed to protect 12 AWG THW copper branch conductor?
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Refer: NEC 240.4 (D) (5)
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