JOURNEYSMAN EXAM GENERAL KNOWLEDGE
1. Definition of a continuous load: - Answer: A load where the maximum current is expected to continue for at least 3 hours.
2. Current drawn by a 3-hp, 240-volt, 3-phase motor (90% efficiency, 95% power factor): - Answer: 6.3 amperes.
3. Kilowatts used by a...
- Answer: A load where the maximum current is expected to continue for at least 3 hours.
2. Current drawn by a 3-hp, 240-volt, 3-phase motor (90% efficiency, 95% power factor):
- Answer: 6.3 amperes.
3. Kilowatts used by a three-phase, 480-volt AC motor drawing 52 amperes with an 88% power factor:
- Answer: Approximately 38 kW.
4. Resistor value for colored bands: orange, red, brown, silver:
- Answer: 320 Ohms (10% tolerance).
5. Resistance associated with a 1,500-watt appliance connected to 120 volts:
- Answer: 9.6 Ohms.
6. Horsepower to watts conversion:
- Answer: One horsepower is equal to 746 watts.
7. Type of surge protection device for installation between service transformer and service disconnect:
- Answer: Type 1.
8. Definition of askarel:
- Answer: A group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating
media.
9. Workspace requirement for equipment that is 60 inches in height:
- Answer: The workspace shall extend 78 inches from the grade, floor, or platform.
, 10. Recess distance for metallic plugs or plates in nonmetallic enclosures:
- Answer: 1/4 inch.
11. Minimum space required above unshielded switchboard or switchgear to any combustible ceiling:
- Answer: 36 inches.
12. Recommended maximum total voltage drop on feeders and branch circuits:
- Answer: 5%.
13. Identification color for the negative ungrounded conductor in a DC system:
- Answer: Black.
14. Type of conduit not permitted for underground service conductors:
- Answer: FMC (Flexible Metal Conduit).
15. Maximum duration for temporary electric power and lighting installations for holiday decorative
lighting:
- Answer: 90 days.
16. Maximum voltage drop for branch circuits serving sensitive electronic equipment operating at 120
volts line-to-line:
- Answer: 1.5%.
17. Identification color for the positive ungrounded conductor in a DC system:
- Answer: Red.
18. Feeder conductor size requirement when supplying continuous and noncontinuous loads:
- Answer: Minimum ampacity shall be not less than the noncontinuous load plus 125% of the
continuous load.
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