more efficiently uses available engine power
operates at a lower efficiency at a fixed speed
produces the same torque at lower engine power
develops its rated power at a lower speed
第1题：
Compared 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
第2题：
A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?
A.When dead in the water，it is often difficult to find the neutral position and slight headway or sternway may result
B.When going directly from full ahead to full astern，there is complete steering control
C.When the vessel has headway and the propeller is in neutral，there is no effect on rudder control
D.When maneuvering in port，full ahead or astern power can usually be obtained without changing shaft RPM
第3题：
Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.
A.apparent slip
B.true slip
C.pitch
D.propulsive efficiency
第4题：
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
第5题：
音名（Pitch name）
第6题：
_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angle
A.An external mechanism
B.An internal mechanism
C.An interlock device
D.A hunting gear system
第7题：
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
A对
B错
第8题：
A controllable pitch propeller on a diesel driven vessel eliminates the need for
A.friction clutches
B.disconnect clutches
C.reversing gears
D.reduction gears
第9题：
音高（Pitch）
第10题：
pitch