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单选题
For a diesel engine, when the piston is at the (), the clearance volume is the largest.
A
TDC
B
DTC
C
BDC
D
DBC
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单选题What determines the number of events occurring in a cycle of operation in an internal combustion engine?()A
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Distance a piston travels during a strokeD
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单选题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 wallA
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单选题When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of ()A
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单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring()A
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sideC
gapD
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transferred to water cooled cylinder wallsC
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单选题Scuffed cylinder liner surfaces in a diesel engine can result form()A
starting the engine hotB
knurling the piston skirtC
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单选题In a diesel engine, when the fuel is injected into the cylinder,()A
the piston is just coming upward from the bottom dead centerB
the piston has moved about one-fifth of the way upC
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单选题The function of the piston compression rings used in a diesel engine is to ()A
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transmit heat from the piston to the cylinder linerC
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单选题Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?()A
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Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the portsC
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单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of ()A
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faulty combustion in that cylinderC
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单选题Persistent knocking in one cylinder of a diesel engine could be caused by().A
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improve skirt lubricationB
allow for expansionC
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单选题On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the ().A
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单选题During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?()A
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单选题The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the ().A
camshaftB
reduction gearsC
rocker armD
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单选题The function of diesel engine piston compression rings is to ().A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
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单选题In a diesel engine, when installing new piston rings it is important to check() Ⅰ.ring gap clearance Ⅱ.side clearanceA
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Ⅱ onlyC
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单选题When installing rings on a diesel engine piston, you should check the ring()A
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gap clearanceC
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单选题Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will()A
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单选题When fuel is injected in a diesel engine cylinder too early, ()A
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fuel economy is not affectedC
exhaust gas temperature will be unchangedD
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单选题A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to ()A
early fuel injectionB
excessive bearing play within the running gearC
overloading of the cylinderD
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单选题If sludge accumulates on the underside of a diesel engine piston, it will()A
cause blow-byB
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