單項選擇題

An over-speed trip serves to （）

A.stop the engine by cutting off the cooling water supply
B.stop the engine by closing the air intake
C.slow the engine but not stop it
D.slow the engine to half of normal load

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單項選擇題

Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）

A.increase the liner area covered by the oil film
B.maintain an oil film on the lower liner where scuffing is prevalent
C.keep excess oil away from intake and exhaust ports
D.help cushion piston skirt side thrust by providing a hydrodynamic oil wedge

單項選擇題

In describing basic diesel engine operation，the term ‘event’ refers to （）

A.the production of high pressure gases
B.the removal of expended combustion gases
C.the admission of air to the cylinder
D.all of the above

An over-speed trip serves to （）

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Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）

In describing basic diesel engine operation，the term ‘event’ refers to （）

In describing basic diesel engine operation，the term ‘event’ refers to （）