Journeyman Electrician Practice Test- 32
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Question 1 of 10
1. Question
1 pointsWhich of the following is the maximum number of receptacles permitted on a 15-ampere breaker supplied by a normal 120 volts power source in a retail shop?
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Refer : NEC 220.14(I)
The Minimum calculated load of receptacle other than dwelling unit = 180 volt-ampere
The receptacle ampere rating = 180 / 120 = 1.5 ampere
The maximum number of receptacles permitted = 15/1.5 = 10. -
Question 2 of 10
2. Question
1 pointsWhich of the following is the total load of a 2500 sq ft dwelling unit that has 20 receptacles and 15 luminaries each rated 100w?
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Refer : NEC 220.14
In case of dwelling unit load calculations , no general receptacles and lighting outlets are not required. these are covered under general lighting load ( 3 Volt-Ampere per sq ft) specified in NEC Table 220.12
So total load = 2500 * 3 = 7500 Volt-Amperes -
Question 3 of 10
3. Question
1 pointsIf the circuits are rated more than 20 amperes, the fluorescent luminaries cannot be installed on circuits?
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Question 4 of 10
4. Question
1 pointsThe overload protection of the equipment is rated at 25 A which of the following conductor shall be used?
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Question 5 of 10
5. Question
1 pointsAn electric circuit has an over current device rated at 1170 A using three sets of conductors with one per each phase. what is the minimum size of that can be used?
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Conductor ampacity per page = 1170/3 = 390 A
Refer : NEC Table 310.15(B)(16)
As per the table 600 kcmil copper conductor is suitable to use with 420 A ampacity at 75 0 C . -
Question 6 of 10
6. Question
1 pointsWhat is the general phase angle between primary and secondary of a transformer?
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Question 7 of 10
7. Question
1 pointsA three phase 4 wire electrical system phase to phase voltage is 480 Volts. what is its phase to neutral voltage?
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480/1.732 = 277 volts
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Question 8 of 10
8. Question
1 pointsHow many joules of energy will a 20 W Lamp dissipates in 5 minutes?
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E = watts * seconds
= 20 * 300 = 6000 -
Question 9 of 10
9. Question
1 pointsWhat is the minimum time that a fuel cell system should supply emergency power in-case of normal power failure?
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Question 10 of 10
10. Question
1 pointsA single phase motor full load current is 28 A, What is its over current device rating in amperes?
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Incorrect
over current device rating = 1.15 * 28 = 32.2 A (35 closest)
Practice Test- Notes:
- In calculating track lighting load, The minimum load that should be considered is 150 VA per 2 sq.ft of track length.