In reducing engine speed to an efficient propeller speed by the use of reduction gears,_________.（易）

In reducing engine speed to an efficient propeller speed by the use of reduction gears,( )

A、speed and torque are both reduced
B、speed is reduced and torque remains unchanged
C、speed is reduced and torque is increased
D、speed is sometimes unchanged while torque is increased

船舶主推进装置1..3船舶推进装置1..3.1推进装置的传动方式In reducing engine speed to an efficient propeller speed by the use of

A、speed and torque are both reduced
B、speed is reduced and torque remains unchanged
C、speed is reduced and torque is increased
D、speed is sometimes unchanged while torque is increased

A low speed engine requires ________ reduction gearbox ________ it and propeller.

A、none / both
B、no / both
C、none / between
D、no / between

Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller

A、

must churn(搅拌)the oil in the sump

is connected to the propeller shaft

is driven at the highest r/min

compensates(补偿) for alignment variations between the engine and pinion gear(小齿轮)