In ____, a pre-plating step is accomplished by carefully cleaning the plastics part and etching the surface to ensure adhesion.         ?

A. ?vacuum metallizing
B. ?electroplating
C. ?flame coating
D. ?knife coating


Answer: B

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Where is the reversing valve located in a split-system air-to-air heat pump?

a. Air handler b. Indoor coil c. Heat exchanger d. Outdoor unit

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If the rubber gasket on the radiator cap is cracked, the engine could lose power

Indicate whether the statement is true or false.

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How are safety ratings for zeotropic refrigerants different than for compounds?

A) Zeotropic refrigerants are assigned a safety group classification based on the worst case of fractionation. B) Zeotropic refrigerants use the same rating system as all other refrigerants. C) They precede the normal letter and number with the letter Z for zeotropic. D) They follow the normal letter and number rating with the letter Z for zeotropic.

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Alexander von Humboldt was the first to notice that:

A. vegetation was distinctly different all around the globe. B. ocean currents brought oxygen to ocean plants. C. similar vegetation grew in areas with similar climate around the globe. D. tectonic plates caused the volcanoes that brought plant nutrients from the earth's core to the surface.

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