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


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1.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

3.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

4.單項選擇題Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.

A.toxic
B.flammable
C.explosive
D.all of the above

5.單項選擇題Which of the following is operated from the main engine room console on an automated vessel?（）

A.Fire pump and lube oil pump
B.Lube oil pump and distilling plant
C.Distilling plant and shaft alley door
D.Shaft alley door and fixed CO2 release