單項選擇題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


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2.單項選擇題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

3.單項選擇題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

5.單項選擇題Which of the following terms is used to identify the pressure of the liquid entering a pump?（）

A.Suction head
B.Pump head
C.Discharge head
D.Total head