单项选择题
Cast iron pistons used in large propulsion diesel engines are constructed with （）
A.not taper what so ever
B.the skirt being tapered and smaller than the crown
C.the skirt being tapered and larger than the crown
D.the crown being tapered and smaller than the skirt
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The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）
A.dirt
B.fuel oil
C.governor cooling water
D.fuel oil tars -
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Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
A.Sensitivity
B.Power
C.Speed droop
D.Compensation -
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A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in （）
A.excessive time required for warming-up
B.excessive freshwater corrosion
C.scale formation on the saltwater side
D.saltwater mixing with the freshwater
