C．ompared to a constant pitch propeller, a controllable pitch propeller

A．more efficiently uses available engine power

B．operates at a lower efficiency at a fixed speed

C．produces the same torque at lower engine power

D．develops its rated power at a lower speed

[单选题]A． controllable pitch propeller on a diesel driven vessel eliminates the need forA．friction clutchesB．disconnect clutchesC．reversing gearsD．reduction gears

[单选题]A variable pitch propeller is made （） a boss with separate blades mounted into it.A . ofB . up ofC . fromD . out

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termedA．apparent slipB．true slipC．pitchD．propulsive efficiency

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.A．apparent slipB．true slipC．pitchD．propulsive efficiency

[名词解释] pitch

[名词解释] 音高（Pitch）

[单选题]_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angleA．An external mechanismB．An internal mechanismC．An interlock deviceD．A hunting gear system

[名词解释] 音名（Pitch name）

[单选题]If your propeller is racing in rough weather，you should（）.A . decrease your engine speedB . ignore itC . increase your engine speedD . stop your engine until the rough weather passe

[单选题]“Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired, or at least patched up temporarily until the next stop” This sentence means that （）.A . Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaire