Two technicians are discussing U.S. thread sizes. Technician A says fastener threads can be fine or coarse. Technician B says that fine threads provide greater holding strength in soft materials. Who is correct?

A. A only
B. B only
C. Both A and B
D. Neither A nor B


Answer: A

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When elastomeric insulation is exposed to high temperature, it will _____.

a. catch fire b. melt c. harden d. deform

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Reactive power (Pr) in a capacitor is defined as the rate at which a capacitor stores or returns energy and is measured in:

A) volt-ampere reactive. B) volts per time constant. C) watts reactive. D) current per time constant.

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The air flow rate in a duct can be found by multiplying the area of the duct times the air speed in the duct.

Answer the following statement true (T) or false (F)

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If only 25 percent of the light produced by an emitter is received by the detector due to unclear air, an excess gain of __________ is required to overcome the loss of light.

A. 1´ B. 2´ C. 4´ D. 8´

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