單項選擇題A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

A.temperature of the exhaust gases
B.energy supplied to the turbocharger
C.air pressure to the intake manifold
D.purge of exhausted gases from the cylinders


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1.單項選擇題A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）

A.increase in engine speed
B.increase in cylinder turbulence
C.leaking needle valve
D.reduction in cylinder turbulence

2.單項選擇題While maneuvering, you discover heavy smoke coming from the turbocharger casing, you should （）

A.check the air filter for dirt
B.check for an exhaust leak
C.check the cooling water temperature
D.notify the bridge that you are going to shut the engine down

3.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

4.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

5.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