單項(xiàng)選擇題Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）

A.Reduce engine speed to idle before removing the filter
B.Soak the dirty filter in kerosene only
C.Blow out the air inlet with compressed air
D.Cover the air inlet after removing the filter


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1.單項(xiàng)選擇題Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?（）

A.Excessive wear
B.Scuffing of the liner
C.Piston seizure
D.All of the above

2.單項(xiàng)選擇題When installing rings on a diesel engine piston, you should check the ring（）

A.diametrical tension
B.gap clearance
C.radial thickness
D.face thickness

3.單項(xiàng)選擇題If the piston ring gap remains insufficient when installing new rings, youshould（）

A.install oversized rings
B.hone the cylinder liner to allow ring installation
C.compress the rings tighter with a compressing tool
D.file the ends of the rings

4.單項(xiàng)選擇題Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）

A.jam in the most worn part of the cylinder when the rings expand
B.break in the most worn part of the cylinder when the rings expand
C.wear eccentrically on the side opposite the end gap
D.overheat and jam at the top center on the combustion stroke

5.單項(xiàng)選擇題Before being shut down, a diesel engine should idle a few minutes in orderto （）

A.prevent governor surging at shutdown
B.make sure the fuel nozzles are flushed clean
C.prevent pressure buildup in the fuel lines
D.prevent damage from localized overheating