单项选择题

Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）

A.Increased turbulence
B.increased mechanical efficiency
C.Increased brake mean effective pressure
D.All of the above

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单项选择题

Late fuel injection in a diesel engine is indicated by low firing pressure with（）

A.high exhaust temperature
B.low exhaust temperature
C.fuel knock in each cylinder
D.mechanical knock in each cylinder

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In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）

A.sea water temperature must never be warmer than 40℃
B.jacket water pressure should always be greater than the sea water pressure
C.jacket water temperature must always be less than 60℃
D.jacket water pressure must always be less than the sea water pressure

单项选择题

In a medium speed diesel engine, a trunk type piston may be cooled by（）
Ⅰ.oil circulation though passages in the piston crown
Ⅱ.heat transfer through piston rings and liner wall

A.Ⅰ only
B.Ⅱ only
C.either Ⅰ or Ⅱ
D.neither Ⅰ or Ⅱ