When working in a confined space where concentrations of harmful substances are very high, why should atmosphere-supplying respirators be worn?
A) To supply clean breathing air from a compressed air source
B) To enable asphyxiation to occur in a very short time
C) To circulate odorless, tasteless, invisible refrigerants
D) To purify air of harmful dust, mist, metal, fumes, and vapors
A
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Symptoms of ____ include slow-cranking, discharged battery, low instrument panel ammeter or voltmeter readings, and charge indicator lamp on.
A. overcharging B. excessive current drain C. undercharging D. belt wear
Collar beams are normally included ____.
A. on every rafter B. on misshapen rafters C. on the end rafters D. on every second or third pair of rafters
Barriers are required in all service-entrance motor-control centers to ____ and terminals from the remainder of the motor-control center.
A. isolate service busbars B. connect the branch circuit C. provide protection to the motor D. isolate vertical sections
Which of these is an explosive (pyrotechnic) device that tightens the seat belt as the airbag is being deployed?
A) Belt switch B) Clockspring C) Pretensioner D) Igniter