單項選擇題In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

A.Bedplate
B.Block
C.Base
D.Sump


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1.單項選擇題Valve lash, or clearance refers to the （）

A.clearance between the top of the valve stem and the rocker arm
B.compression of the valve springs
C.clearance between the valve seat inserts and the head
D.out of roundness of the fuel injection cams

2.單項選擇題Auxiliary diesel engines can be automatically shut down as a result of （）

A.low lube oil temperature
B.low lube oil pressure
C.high exhaust temperature
D.high cooling water pressure

3.單項選擇題Which of the listed conditions can cause a diesel engine to use too much lube oil?（）

A.Dirty lube oil filter
B.Too much piston ring wear
C.High lube oil viscosity
D.Low lube oil temperature

4.單項選擇題Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）

A.The oil oxidizes and forms carbon deposits
B.The viscosity increases
C.Engine oil consumption decreases
D.Lubricating qualities of the oil are enhanced

5.單項選擇題The oxidation by-products forming in diesel engine lube oil can cause （）

A.pitting
B.sludge
C.hard varnish
D.all of the above