單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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