Journeyman Electrician Practice Test-2
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Question 1 of 20
1. Question
1 pointsThe snap switches equipped in the panel boards are rated at 25 amperes, these switches must be protected not in excess of ……………………..
Correct
Incorrect
Refer : NEC 408.36(A)
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Question 2 of 20
2. Question
1 pointsHow many 12 AWG conductors are allowed in an 12.5 in3 round octagonal outlet box?
Correct
Incorrect
Refer : NEC Table 314.16 (A)
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Question 3 of 20
3. Question
1 pointsThe vertically run metal wire-ways shall be surely supported at intervals not exceeding …………. ft of wire way and shall not have more than one joint between supports.
Correct
Incorrect
Refer : NEC 376.30 [B]
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Question 4 of 20
4. Question
1 pointsThe interior of any dip tank can be considered as ………………. location
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Incorrect
Refer: NEC 516.3 [A]
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Question 5 of 20
5. Question
1 pointsA continuous load is load where the maximum current is expected to continue for ………… hours or more.
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Incorrect
Refer : NEC 100 [definitions]
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Question 6 of 20
6. Question
1 pointsIf the replacement compressor motor draws 35 amperes current, what is the minimum rating for disconnecting means used to protect the motor?
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Incorrect
Refer: NEC 440.12(A)(1)
The disconnecting means of a motor is 115% of motor rating
disconnecting means rating = 35 * 1.15 = 40.25 amperes
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Question 7 of 20
7. Question
1 pointsIf the diameter of the branch conductor is doubled, the resistance of conductor …….
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Incorrect
Solution :
R œ 1/ A
Where A = area = (Π D2 / 4)
So the resistance decreases with diameter doubled. -
Question 8 of 20
8. Question
1 pointsOver head conductors for festoon lighting shall not be smaller than ………….. .
Correct
Incorrect
Refer : 225.6 (A)(2)
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Question 9 of 20
9. Question
1 pointsWhat is the corrected ampacity of a 2/0 THWN conductors in a dry location. If the ambient temperature of location is 400C?
Correct
Incorrect
NEC Table 310.15(B)(16)
Conductor ampacity of 2/0 at dry location (900C)= 195 Amperes
NEC Table 310.15(B)(2)
The correction factor at ambient temperature (450C) = 0.87
Corrected ampacity = 0.87*195 =170 Amperes
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Question 10 of 20
10. Question
1 pointsWhat is the minimum size THWN branch circuit conductor required for a 20 HP, 480-volt, 3 Phase Induction type squirrel cage motor with nameplate FLI of 26.5 amps?
Correct
Incorrect
Refer: NEC Table 430.250
FLI of 20 HP 3 phase motor at 460 volts = 27 amperesRefer: NEC 210.20(A)
Conductor ampacity = 27 * 1.25 = 33.75Refer: NEC Table 310.15(B)(16)
Minimum conductor size =10 AWG THWN with 35 amperes capacity is suitable conductor -
Question 11 of 20
11. Question
1 pointsWhat is the total voltage drop in a 12 AWG conductor that supply a 18 ampere load which is located 50 feet from the power source? The resistance of conductor is 2 ohm/1000 feet.
Correct
Incorrect
Total Resistance of conductor for 50 feet length = 2/1000 * 50 = 0.1 ohm;
Voltage Drop = I * R = 18 * 0.1 = 1.8 volts
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Question 12 of 20
12. Question
1 pointsA transformer having 1600 turns in primary winding and 400 turns in secondary winding is supplied with 120 volts AC. What is its secondary voltage.
Correct
Incorrect
Solution:
Secondary Voltage = Turns ratio * Primary Voltage
= 400 / 1600 * 120 = 30 Volts. -
Question 13 of 20
13. Question
1 pointsThe ungrounded ducts or conduits should be sealed before entering buildings.
Correct
Refer : 230.8
( To prevent unwanted gases entry in buildings)Incorrect
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Question 14 of 20
14. Question
1 pointsWhat is the minimum percentage rated voltage that a storage battery should supply the emergency load?
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Incorrect
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Question 15 of 20
15. Question
1 pointsAn 120 voltage source is supplying a lamp with a resistance of 172 ohms. what is the current flow in the circuit?
Correct
Incorrect
Current Flow = 120/172 = 0.7 amperes
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Question 16 of 20
16. Question
1 pointsWhat is the maximum constant wattage per linear meter allowed for heating cables embedded in concrete?
Correct
Incorrect
Refer: NEC Section 424.4 (A)
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Question 17 of 20
17. Question
1 pointsWhich of the following wiring methods that can be used for underfloor wiring in computer room in a building?
Correct
Incorrect
Refer: NEC 645.(E)(2)
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Question 18 of 20
18. Question
1 pointsWhat is the maximum standard over current device rating used to protect instrument circuits located in a panel board?
Correct
Incorrect
Refer : NEC 408.52
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Question 19 of 20
19. Question
1 pointsA 8 AWG conductor is suitable to use at maximum ………… KW supplied with a 120 volts power source?
Correct
Incorrect
Refer : NEC Table 310.15(B)(16)
maximum ampacity of 8 AWG is 50 amperes.
E = 120 volts
maximum power = 120 * 50 = 6000 watts or 6 KW
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Question 20 of 20
20. Question
1 pointsWhich of the following each unit must always required a 20 ampere laundry circuit?
Correct
Incorrect
Refer : NEC 210.52(F)
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