Journeyman Electrician Exam Practice Test-39
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Free Online Practice Test on Journeyman Electrician Exam – 39
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Question 1 of 10
1. Question
1 pointsWhat is the adjustment ampacity of a 3/0 THWN conductors in a wet location, if the raceway contains seven conductors in it?
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3/0 THWN conductor ampacity in wet location = 175 amperes ( NEC Table 310.15 (B)(16)) (750 C)
For seven conductors in a raceway, the ampacity adjustment factor = 0.70 ( NEC Table 310.15(B)(3)(a)
The adjustment ampacity of each conductor = 0.7 * 175 = 122.5 amperes
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Question 2 of 10
2. Question
1 pointsAt which of the following percentage the demand factor for six house hold electric cloth dryers is calculated?
Correct
Refer: NEC 220.54
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Question 3 of 10
3. Question
1 pointsWhat is the unit load per square foot in volt ampere for a restaurant?
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Refer: NEC table 220.12
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Question 4 of 10
4. Question
1 pointsWhat is permissible voltage drop in percentage for combination of both feeders and branch circuit conductors?
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Refer: NEC 215.2(A) (4)
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Question 5 of 10
5. Question
1 pointsWhat is the minimum rated ampacity of each power supply circuit that supplies 30 volts lighting circuit?
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Refer : NEC 411.2
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Question 6 of 10
6. Question
1 pointsFor inductive rating the branch circuits must be sized according to wattage rating not VA rating.
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Question 7 of 10
7. Question
1 pointsThe overall length of the power supply cards for mobile homes shall not be less than ………… feet
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Refer: NEC 550.10(D)
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Question 8 of 10
8. Question
1 pointsA device which converts AC input into pulsating DC output is called as ………………
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Question 9 of 10
9. Question
1 pointsWhich of the following is not a standard fuse rating of a electrical fuse as per NEC?
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Question 10 of 10
10. Question
1 pointsA lamp operating at 120 volts has a resistance of 480 ohms. What is the wattage of the lamp?
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P = V2 / R = 120 * 120 / 480 = 30 watts