The defrost timer contacts are operated by a(n) ____ that is gear-driven by an electric wall clock motor.

a. lever
b. shaft
c. eccentric disc
d. cam


d. cam

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Which number is greater: -4 or 4?

A) 4 B) -4

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Besides the Germans, Rome also faced a threat in the east from

a. Egypt. b. Persia. c. Syria. d. India.

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What component does not store refrigerant during a low side pump down?

A. The main evaporator B. The subcooler C. The condenser D. The receiver tank

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Which refrigerant will likely become scarce after the year 2020?

A) HCFC-123 B) HFC-410A C) HFC-134a D) Ammonia

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