Exam (elaborations)
4A251B V1
Exam of 15 pages for the course PC Board at PC Board (4A251B V1)
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4A251B V1(017) How long is an Alaska Medical Shelter System (AKMSS) designed to
last when erected or stored?
a. 10 years; 30 years.
b. 10 years; 20 years.
✅✅
c. 20 years; 30 years.
d. 20 years; 20 years. - -b. 10 years; 20 years.
1. (001) How are large transformers cooled?
a. Immersion in oil.
b. Fan circulating air.
✅✅
c. Free flowing water.
d. Stationary air conditioner. - -a. Immersion in oil.
10. (002) What is used to count ground-referenced electrons in an isolated
power system?
a. Ground-referenced circuit-interrupter.
b. In-line metering system.
✅✅
c. Line isolation monitor (LIM).
d. Circuit breaker. - -c. Line isolation monitor (LIM).
11. (003) What three branches make up the essential electrical system?
a. Emergency, utilities, and equipment.
b. Critical, equipment, and emergency.
✅✅
c. Life safety, utilities, and equipment.
d. Life safety, critical, and equipment. - -d. Life safety, critical, and
equipment.
12. (003) What minimum full-demand fuel supply are you required to have
onsite for an emergency generator?
a. 1 hours' worth.
b. 2 hours' worth.
✅✅
c. 5 hours' worth.
d. 8 hours' worth. - -c. 5 hours' worth.
13. (003) How often should you exercise an emergency generator under full
load?
a. 30 minutes at least once quarterly.
b. 60 minutes at least once quarterly.
, ✅✅-c. 30 minutes at least once
c. 30 minutes at least once monthly.
d. 60 minutes at least once monthly. -
monthly.
14. (004) What type of circuit provides power to the final overcurrent devices?
a. Branch.
b. Feeder.
✅✅
c. Primary.
d. Secondary. - -b. Feeder.
15. (004) The amount of current a conductor can safely carry depends on the
metal used, wire size, type of insulation, and
a. length of the wire.
b. type of load device.
✅✅
c. type of wiring system.
d. location of the conductor. - -d. location of the conductor.
16. (004) What type of wiring system includes wire sizes No. 40 to No. 4/0?
a. Micro-critical manner (MCM).
b. American Wire Gauge (AWG).
✅✅
c. Thousands of circular mils (kcmil).
d. National Electrical Code (NEC). - -b. American Wire Gauge (AWG).
17. (004) Which wiring system would you use in small structures where the
main need is for lighting?
a. Three-wire, single-phase.
b. Two-wire, single-phase.
✅✅
c. Three-phase, three-wire.
d. Three phase, four-wire. - -b. Two-wire, single-phase.
18. (004) Which wiring system uses two ungrounded conductors and one
neutral conductor to provide power and light?
a. Three-wire, single-phase.
b. Two-wire, single-phase.
✅✅
c. Three-phase, three-wire.
d. Three-phase, four-wire. - -a. Three-wire, single-phase.
19. (004) What three-phase, four-wire system does the Air Force permit for
use in medical facilities?
a. Star-powered.
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