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
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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
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
A.worn main bearing journals
B.torsional stress deformation
C.slack thrust bearings
D.bearing shells shim dimensions
A.contaminated with sludge
B.contaminated with carbon
C.diluted with fuel oil
D.diluted with water
A.the solid impurities of large particle
B.the solid impurities of fine particle
C.the water content
D.both water and solid impurities
最新試題
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.
To determine if the lube oil filter elements need changing, （）.
If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
In a simple mechanical governor, the （）.
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
A diesel engine piston ring face is in direct contact with the （）.
How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）