單項選擇題One of the advantages in the use of a dry liner over a wet liner is（）

A.it is fitted with neoprene O-ring seals
B.the honing process makes it easier to maintain the desired oil film
C.there is likelihood of water leaking into the combustion space
D.it fits more loosely due to a decrease in heat transfer through the composite wall


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1.單項選擇題One characteristic of a pulse type turbo-charging system is（）

A.high average exhaust manifold
B.greatly fluctuating inlet manifold pressure
C.constant exhaust manifold pressure
D.multiple exhaust pipes to the turbocharger

2.單項選擇題One advantage of dry cylinder liners used in a diesel engine is the（）

A.lower thermal expansion rates than wet liners
B.greater heat transfer rate than wet liners
C.greater wear resistance than wet liners
D.procedure to replace dry liners is simpler than for wet liners

3.單項選擇題Intake air flow from a diesel engine turbocharger is directly proportional to engine（）

A.exhaust gas pressure
B.exhaust gas temperature
C.speed
D.load

4.單項選擇題Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? （）

A.Viscosity is decreased
B.Octane number is altered
C.Pump speed is decreased
D.Blower’s speed is decreased

5.單項選擇題It is easier to replace a dry cylinder liner than a wet one because（）

A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall