Journeyman Electrician Practice Test-21
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Free journeyman electrician test – 21
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Question 1 of 10
1. Question
1 pointsThe resistance of the very large wire is 220 ohms, at 230 volts ac power supply. What is its resistance when a same value of DC power supply is supplied to it?
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The resistance of larger wire is high if it is supplied with DC power supply compared to AC power supply.
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Question 2 of 10
2. Question
1 pointsThe maximum load on a feeder or branch circuit must not exceed …………………… of normal rating of the feeder or branch circuit.
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Question 3 of 10
3. Question
1 pointsNo. 12 Type T or TW wire in conduit has an ampacity of 20; if you install it in a 50 0 C ambient, what is its new ampacity?
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If the wire is installed higher temperature than its rated then its ampacity will derate.
20 * 58% = 11.6 amperes -
Question 4 of 10
4. Question
1 pointsTwo smaller wires need not have same cross sectional area to be connected in parallel to form a large wire.
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Question 5 of 10
5. Question
1 pointsFor equipment supplied by two ungrounded wires, ………………….. switches may be used to disconnect the circuit.
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Question 6 of 10
6. Question
1 pointsThe voltage between conductors on branch circuits supplying screw-shell lamp-holders, receptacles of dwelling units may not exceed…………. volts, except for permanently connected appliances.
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Question 7 of 10
7. Question
1 pointsThe demand factor in calculating ampacity should never applied to branch circuits.
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Question 8 of 10
8. Question
1 pointsThe current in electrical circuit takes the least resistance path.
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Question 9 of 10
9. Question
1 pointsAn AC system of less than 50 Volts must be grounded which of the following conditions?
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Refer : NEC 250.20 (A)
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Question 10 of 10
10. Question
1 pointsThe total current flows through the 3-wire single phase electrical system is ……………………………
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Journeyman electrician Test :
Note 1:
If two circuit paths with low resistance and high resistance are there, Then current flow will choose the path which has low resistance.
Note 2:
The ampacity of the conductor that supply a single motor which is used continuous duty applications shall be 125% of the FLC of the motor. 430.6(A)(1)
So for calculating the conductor size we must multiply full load current by 1.25 and NEC Table 310.16 should be checked for correct wire.