单项选择题
A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.
A.mechanical energy to kinetic energy to potential energy
B.mechanical energy to potential energy to kinetic energy
C.potential energy to mechanical energy to kinetic energy
D.kinetic energy to mechanical energy to potential energy
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
