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名词解释题
音高（Pitch）
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考题
Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.A.apparent slipB.true slipC.pitchD.propulsive efficiency
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_____ 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
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Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）A对B错
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Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
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当正副驾驶的姿态、指示，即俯仰、翻滚、指示相差5度时（）。A、PITCH显示在PFD左侧，ROLL显示在PFD右侧B、只显示PITCH在PFD上C、只显示ROLL在PFD上D、PITCH显示在PFD右侧，ROLL显示在PFD左侧
考题
单选题（） is made of a boss with separated blades mounted into it.A
A variable pitch propellerB
A variable pitch nutC
A fixed pitch parallelD
A fixed pitch screw
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单选题For vessels with （）, the meaning of the order would include the combination of pitch and revolutions as indicated in ships orders.A
fixed pitch propellersB
uncontrollable pitch propellerC
constant pitch propellersD
variable pitch propellers
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单选题Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）A
Slightly higher fuel consumptionB
Lack of directional control when backingC
Inefficient at high shaft RPMD
Some unusual handling characteristics
考题
单选题Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.A
apparent slipB
tree slipC
pitchD
propulsive efficiency
考题
判断题Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）A
对B
错
考题
单选题By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）A
HydraulicB
MechanicalC
PneumaticD
Electrical
考题
单选题Compared to a constant pitch propeller, a controllable pitch propeller（）.A
more efficiently uses available engine powerB
operates at a lower efficiency at a fixed speedC
produces the same torque at lower engine powerD
develops its rated power at a lower speed
考题
单选题The pitch ratio of a propeller is the mean pitch divided by （）.A
the propeller diameterB
the propeller radiusC
the pitch angleD
the length of helix
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