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單項(xiàng)選擇題

A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.

A.open
B.close
C.remain in its position
D.flood the evaporator with refrigerant

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單項(xiàng)選擇題

Black smoke coming from a boiler can be caused by （）.

A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio

單項(xiàng)選擇題

Which will cause the high pressure cutout to stop the compressor in a R-22 system?（）

A.Condenser leakage
B.A shortage of liquid refrigerant
C.Excessive frost on the evaporator
D.Not enough condenser cooling water