單項(xiàng)選擇題In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.

A.the beveled edges of the intake valves provide for serf-centering during seating
B.intake valves utilize stellite-coated valve seat inserts which reduce wear
C.the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D.intake valves are less affected to the corrosive action of exhaust gases


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1.單項(xiàng)選擇題What preventative maintenance should be done frequently to diesel engine starting air receivers?（）

A.Drain the accumulated moisture
B.Test the relief valves
C.Watch the temperature to prevent fluctuations in pressure
D.Clean the interior to remove oil and foreign matter

2.單項(xiàng)選擇題Crank web deflection readings will give a positive indication of （）.

A.worn main bearing journals
B.torsional stress deformation
C.slack thrust bearings
D.bearing shells shim dimensions

3.單項(xiàng)選擇題A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.

A.contaminated with sludge
B.contaminated with carbon
C.diluted with fuel oil
D.diluted with water

4.單項(xiàng)選擇題The emulsion of the oil is mainly caused by （）.

A.the solid impurities of large particle
B.the solid impurities of fine particle
C.the water content
D.both water and solid impurities