單項(xiàng)選擇題Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

A.Splash lubrication
B.Pressure lubrication
C.Sight feed lubricators
D.Mechanical lubricators


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1.單項(xiàng)選擇題Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.

A.react with insufficient speed droop
B.fail to react to small speed changes
C.have excessive sensitivity to small speed changes
D.remain in the neutral position

2.單項(xiàng)選擇題Fusible plugs are installed in fire-tube boilers to （）.

A.provide a means of draining the boiler
B.warn the engineer of low water level
C.cool the crown sheet at high firing rates
D.open the burners electrical firing circuits

3.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

4.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

5.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