单项选择题

If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?（）

A.Centrifugal
B.Gear
C.Propeller
D.Turbine

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单项选择题

The clearance volume for a single stage compressor is defined as the space created between the （）.

A.top of the piston and bottom side of head, with the piston at BDC
B.piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDC
C.bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placement
D.top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC

单项选择题

Demulsibility of a lube oil is defined as （）.

A.the ability of oil to separate from water
B.the temperature at which oil flows rapidly
C.a measure of the water in a lube oil system
D.an emulsion of different grades of oil

单项选择题

When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）

A.CO₂
B.Methyl chloride
C.R-22
D.Sulphur dioxide