單項選擇題

If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）

A.The wearing rings are excessively worn
B.The suction strainer is clogged
C.The discharge valve is clogged
D.The shaft is worn

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單項選擇題

The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.

A.sudden evaporation of wax crystals in the lubricant
B.sudden evaporation of entrapped air in the lubricant
C.release of refrigerant from the oil/refrigerant mixture
D.release of dissolved lubricant from the refrigerant

單項選擇題

One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the （）.

A.motor overload will open
B.relief valve will open
C.pump will overheat
D.motor will overheat

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If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）

你可能感興趣的試題

The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.

One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the （）.

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