Pitting in the area close to the pitch...

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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1.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

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2.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

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3.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

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4.单项选择题Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?（）

A.Lubrication to the defective cylinder should be increased
B.Cooling water temperature to the engine should be increased
C.Only the turbocharger speed should be reduced
D.Engine speed should be reduced

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5.单项选择题A diesel engine could fail to start because of （）

A.incorrect injection timing
B.low exhaust back pressure
C.floating exhaust valves
D.excessive cranking speed

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6.单项选择题Excessive vibration in an operating diesel generator may be caused by （）

A.electrical overload
B.surging at governed RPM
C.loose engine mounting bolts
D.coolant leaking into the cylinder

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7.单项选择题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）

A.check the air filter for obstruction
B.check for an exhaust leak
C.check the exhaust temperature
D.secure the engine

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8.单项选择题Clogged or partially obstructed exhaust ports on a diesel engine can cause（）

A.over-speeding of the engine
B.failure of the engine to shut down
C.no effect of engine mounting bolts
D.high exhaust temperatures

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9.单项选择题A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）

A.low lube oil temperature
B.low starting air temperature
C.air bubbles in the fuel oil system
D.water in the starting air system

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10.单项选择题Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）

A.Low cooling water outlet temperature
B.High lube oil pressure
C.Low lube oil temperature
D.Low starting air pressure

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