单项选择题

The discharge head of a centrifugal pump will vary directly with the （）.

A.change in impeller diameter
B.square of the impeller diameter
C.cube of the impeller diameter
D.impeller efficiency for large changes in the size of the impeller

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An increase in the heat load to a refrigeration system will cause （）.

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B.the suction temperature to increase
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D.excessive short cycling of the compressor

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Which of the following types of hydraulic pumps would be used in a steering system?（）

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单项选择题

Which of the following statements is true concerning centrifugal pumps?（）

A.They are particularly suited for pumping high viscosity fluids
B.They are started with the discharge valve opened
C.The flow of liquid is developed by imparting energy due to the rotation of an impeller
D.They are always mounted in a horizontal position