Journeyman Electrician Practice Test-29
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Question 1 of 10
1. Question
1 pointsThe minimum working depth …………….. shall be required at electrical equipment rated at 601 volts where it has one side exposed live part and grounded parts at anther side of working space
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Incorrect
Refer : NEC Table 110.34 (1)
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Question 2 of 10
2. Question
1 pointsThe guard ring must be in contact to the earth and shall be buried at a depth from the earth’s surface not less than ………………….
Correct
Incorrect
Refer : NEC 250.53 (F)
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Question 3 of 10
3. Question
1 pointsType AC Cables shall not be permitted to use in the following locations?
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Incorrect
Refer : NEC 310.22
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Question 4 of 10
4. Question
1 pointsWhich of the following is the maximum phase to phase voltage of yard and pier distribution system?
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Incorrect
Refer : NEC 555.4
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Question 5 of 10
5. Question
1 pointsThe unit of power factor is:
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Question 6 of 10
6. Question
1 pointsThe turns ratio of the transformer is 10:4 which of the following is the primary voltage of the transformer if the rated secondary is 120 volts.
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Incorrect
N1/N2 = V1/V2
10/4 = V1 / 120
V1 = 300 volts -
Question 7 of 10
7. Question
1 pointsIf the supply frequency is doubled, the capacitive reactance of the circuit …………..
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Question 8 of 10
8. Question
1 pointsWhich of the following is the maximum permissible current in 400 watts , 1 ohm resistor?
Correct
Incorrect
I2 R = 400
I2 = 400
I =20 amperes -
Question 9 of 10
9. Question
1 pointsThe three phase motor should have overload protection device in each phase.
Correct
Incorrect
Refer : NEC 430.37
Overload protection is not required when overload protection is provided by some other approved means -
Question 10 of 10
10. Question
1 pointsThe ampacity of the tap conductors who’s length is 25 ft long shall be less than ……………….. of the over current device protecting feeder conductors.
Correct
Incorrect
Refer : NEC 240.21 B