Journeyman Electrician Practice Test-3
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Free online quiz test journeyman exam -3 includes NEC questions and basic electrical theory.
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Question 1 of 15
1. Question
1 pointsThe power systems and branch circuits are grounded to limit …………………………
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When a lighting surge or any fault occurs on circuit then a high voltage surge will induce in it which can destroy the circuit. So the high voltage is routed to ground by properly grounding it.
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Question 2 of 15
2. Question
1 pointsEMT shall be securely fastened in place at least every …………..
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Refer: NEC 358.30(A)
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Question 3 of 15
3. Question
1 pointsHow shall be the insulated or bare busbars mounted in panel boards?
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Refer: NEC 408.51
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Question 4 of 15
4. Question
1 pointsA single family dwelling unit has a branch circuit lighting load of 1,90,000 VA. What is the demand load of a dwelling unit after the demand factor applied?
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Solution :
Demand factor for first 3000 is 100% so = 3000 VA
Demand factor for load Between 3000 to 120000VA is 35% = 117000 * 0.35 = 40,950
Demand factor for load above 120000VA is 25% = 70000 * 0.25 = 17500
Total demand load= 3000 + 40950 + 17500 = 61450. -
Question 5 of 15
5. Question
1 pointsIf the resistance of branch circuit conductor decreases, the circuit current will ……………
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Question 6 of 15
6. Question
1 pointsWhat is the maximum allowable ampacity of a NO.6 AWG copper type THW conductor at an ambient temperature of 75 oC?
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Refer: NEC Table 310.16
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Question 7 of 15
7. Question
1 pointsPipe electrodes shall have resistance to ground not to exceed …………. ohms when used alone.
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Question 8 of 15
8. Question
1 pointsThe maximum voltage rating of plug fuse is ………….. volts
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Refer: 240.5 [A]
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Question 9 of 15
9. Question
1 pointsThe ampacity of branch circuit conductors between the controller and multi speed motor shall not be less than ………….. percent of the current rating of the windings.
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Refer : 430.21[B]
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Question 10 of 15
10. Question
1 pointsAutomatic transfer switches rated not less than ……………….. shall be listed for emergency system use.
Correct
Refer : 700.5[C]
Incorrect
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Question 11 of 15
11. Question
1 pointsWhat is the current flow of a 3 kW heat strip connected to 120 volts ac power supply?
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Power = E * I
I = 3 kW / 120
I = 3000 / 120 = 25 ampers
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Question 12 of 15
12. Question
1 pointsIf the resistance of two 12 AWG conductors of 175 feet is 0.4 ohms (0.2 ohms each). What is the power loss in a conductor when the current flow of conductor is 18 amperes?
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Power Loss = I2 R
= 182 * 0.4 = 129.6 watts
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Question 13 of 15
13. Question
1 pointsWhich of the following meter is used to measure resistances in the circuit?
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Question 14 of 15
14. Question
1 pointsThe transformer output power is 136 VA, what is transformer input power if the transformer efficiency is 85%?
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Transformer efficiency = 85% 0r 0.85
output power / input power = 0.85
input power = 136 VA / 0.85 = 160 VA
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Question 15 of 15
15. Question
1 pointsWhat is the measuring unit of circuit resistance represented by a letter R?
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