單項選擇題

Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）

A.formation of carbon on the intake and exhaust ports
B.high water jacket temperatures
C.overheated pistons and cylinders
D.an increase in lube oil viscosity due to fuel dilution

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單項選擇題

In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.

A.produce a scavenging effect in the combustion space
B.equalize cylinder and exhaust manifold pressures
C.alleviate the difference in valve size between the intake and exhaust
D.flush out condensate that collects after each compression stroke

單項選擇題

Early injection timing is indicated by （）.

A.high exhaust temperature and low firing pressure
B.high exhaust temperature and high firing pressure
C.low exhaust temperature and low firing pressure
D.low exhaust temperature and high firing pressure

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Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）

你可能感興趣的試題

In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.

Early injection timing is indicated by （）.

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