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)
Thermistors are widely used to sense temperatures in HVAC systems because they are very _____.
a. compact b. inexpensive c. rugged d. versatile
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.
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