單項(xiàng)選擇題

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

A.the suction pressure to decrease
B.the suction temperature to increase
C.increased ice formation on the evaporator coil
D.excessive short cycling of the compressor

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單項(xiàng)選擇題

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

A.Lobe
B.Screw
C.Radial piston
D.Volute

單項(xiàng)選擇題

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