单项选择题
The ability of an oil to separate cleanly from an oil and water mixture is referred to as its （）.
A.precipitation number
B.neutralization number
C.pour point
D.demulsibility
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单项选择题
When the relief valve opens it discharges high pressure refrigerant vapor to the （）.
A.liquid strainer
B.refrigerant inlet of the condenser
C.inlet side of the evaporator
D.suction side of the compressor -
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
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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
