單項(xiàng)選擇題When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）

A.remains the same
B.is reduced
C.is increased
D.is eliminated


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1.單項(xiàng)選擇題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

2.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

3.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

5.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