单项选择题
Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by （）
A.corrosion on the gears
B.excessive gear speed
C.dirt in the oil
D.misalignment of the gears
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相关考题
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单项选择题
When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to （）
A.maintain alignment when the ship’s hull is working in heavy seas
B.ensure engine vibrations correspond to the natural frequency of the hull
C.permit the engine to expand away from the driven equipment as the engine heats up and expands
D.maintain engine thrust bearing clearances -
单项选择题
Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）
A.must churn the oil in the sump
B.is connected to the propeller shaft
C.is driven at the highest RPM
D.compensates for alignment variations between the engine and pinion gear -
单项选择题
A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）
A.reduce load
B.check your exhaust
C.adjust cooling water temperature
D.increase lube oil flow
