During one stroke in a four-cycle engine, the crankshaft revolves how many degrees?

A) 180 B) 240 C) 720 D) 360


A

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Alternators are often used to control the speed of several induction motors that require different changes in speed.

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

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Thermistors are widely used to sense temperatures in HVAC systems because they are very _____.

a. compact b. inexpensive c. rugged d. versatile

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Hangers for fiberboard duct should be placed no further than every:

A) 12 ft. B) 6 ft. C) 5 ft. D) Fiberboard duct does not require hangers because it is self-supporting.

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Refrigerant identifiers are being discussed.  Technician A says a refrigerant identifier will display R-12 if the refrigerant is 90% CFC-12 by weight. Technician B says a refrigerant identifier will display R-134a if the refrigerant is 98% HFC-134a by weight. Who is correct?

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

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