The energy change that takes place when the atoms of materials are rearranged to form new materials from the same atoms is:

A) The energy of centrifugal force. B) Kinetic energy.
C) The energy of centripetal force. D) Chemical energy.


D

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Maximum allowable ceiling temperatures are typically _________ less than the temperature rating of the heat detector.

A. 1? F B. 5? F C. 10? F D. 20? F

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In water jet cutting, ____________________ are added when hard materials such as metals are being cut.

Fill in the blank(s) with the appropriate word(s).

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Reel mowers:

A. are preferred for high quality cuts. B. require more power than rotary mowers. C. have a chopping-like action. D. are easier to maintain than rotary mowers.

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What type of refrigerants are normally used in CO2 cascade refrigeration systems?

A) CO2 refrigerant in the high-temperature system and HFC refrigerant in the low-temperature system B) HFC refrigerant mixed with CO2 in both systems C) HFC refrigerant in the high-temperature system and CO2 in the low-temperature system D) CO2 refrigerant in both the high- and low-temperature systems

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