The triac operates similar to two SCRs __________.

A. connected in inverse parallel
B. placed back-to-back


Answer: A

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A type system that allows simultaneous heating and cooling to different parts of a building is the:

A) Heat pump variable refrigerant flow system. B) Multisplit system. C) Heat recovery system. D) All of the above.

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The defrost cycle is normally terminated:

A) Based strictly on defrost time to reduce the chance of sensor inaccuracy. B) Based on either temperature, pressure, or time. C) Based strictly on pressure to insure safe operation for the compressor. D) Based strictly on temperature to insure that all the frost has melted.

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Technician A says that most transfer cases have a built in oil pump. Technician B says that most transfer cases use a heavy grease as a lubricant. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

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An example of a compound is ____.

A. carbon dioxide B. tungsten C. salt D. salt water

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