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

题目
单选题
The pitch ratio of a propeller is the mean pitch divided by （）.
A

the propeller diameter

B

the propeller radius

C

the pitch angle

D

the length of helix

相似考题

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

2.Compared to a constant pitch propeller, a controllable pitch propellerA.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

3._____ 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

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

更多“The pitch ratio of a propeller is the mean pitch divided by”相关问题

  • 第1题：

    Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）

    A对

    B错


    对
    略

  • 第2题：

    音高（Pitch）


    正确答案: 用一秒钟的振动数来表示。频率次数多者音高，频率次数少者音低。将每秒振动440次的声音定为“a”，是目前国际通用的标准音。

  • 第3题：

    pitch


    正确答案: 指声音的高低，取决于声带振动的频率，而其频率与声带长度、厚度、紧张度有关。

  • 第4题：

    单选题
    One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.
    A

    the extra weight required for the diesel reduction gearing

    B

    a minimum speed for the engines that limits the minimum speed of the vessel

    C

    the higher fuel consumption per SHP

    D

    the low efficiency of the system when a controllable pitch propeller is used


    正确答案： C
    解析： 暂无解析

  • 第5题：

    名词解释题
    音高（Pitch）

    正确答案： 用一秒钟的振动数来表示。频率次数多者音高，频率次数少者音低。将每秒振动440次的声音定为“a”，是目前国际通用的标准音。
    解析： 暂无解析

  • 第6题：

    单选题
    （） is made of a boss with separated blades mounted into it.
    A

    A variable pitch propeller

    B

    A variable pitch nut

    C

    A fixed pitch parallel

    D

    A fixed pitch screw


    正确答案： A
    解析： 暂无解析

  • 第7题：

    名词解释题
    pitch

    正确答案： 指声音的高低，取决于声带振动的频率，而其频率与声带长度、厚度、紧张度有关。
    解析： 暂无解析

  • 第8题：

    单选题
    Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.
    A

    apparent slip

    B

    tree slip

    C

    pitch

    D

    propulsive efficiency


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The pitch ratio of a propeller is the mean pitch divided by （）.
    A

    the propeller diameter

    B

    the propeller radius

    C

    the pitch angle

    D

    the length of helix


    正确答案： A
    解析： 暂无解析

  • 第10题：

    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 propellers

    B

    uncontrollable pitch propeller

    C

    constant pitch propellers

    D

    variable pitch propellers


    正确答案： B
    解析： 暂无解析

  • 第11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

    Hydraulic

    B

    Mechanical

    C

    Pneumatic

    D

    Electrical


    正确答案： D
    解析： 暂无解析

  • 第12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


    正确答案： 对
    解析： 暂无解析

  • 第13题：

    音名（Pitch name）


    正确答案: 指西洋乐制中代表固定音高的名称。这些名称因国家而异

  • 第14题：

    Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）


    正确答案:正确

  • 第15题：

    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

    正确答案:A

  • 第16题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）
    A

    Slightly higher fuel consumption

    B

    Lack of directional control when backing

    C

    Inefficient at high shaft RPM

    D

    Some unusual handling characteristics


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）
    A

    for FP, once fitted, the position of the blades can also be changed in operation

    B

    for CP, once fitted, the position of the blades can also be changed in operation

    C

    the CP type has a relatively smaller hub compared with the FP propellers

    D

    the FP type has a relatively larger hub compared with the CP propellers


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    A variable pitch propeller is made （） a boss with separate blades mounted into it.
    A

    of

    B

    up of

    C

    from

    D

    out


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    The pitch of a propeller is a measure of the（）.
    A

    angle that the propeller makes with a free stream of water

    B

    angle that the propeller makes with the surface of the water

    C

    number of feet per revolution the propeller is designed to advance in still water without slip

    D

    positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    In using reduction gears to obtain efficient propeller speeds, （）.
    A

    they must be located at the after end of the engine

    B

    they can only be used with one engine at a time

    C

    they eliminate the need for controllable pitch propellers

    D

    they are connected to the engine with a flexible coupling


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    When the propeller blades are integral with the hub, the propeller is called a （）.
    A

    built up propeller

    B

    solid propeller

    C

    controllable pitch propeller

    D

    suction back propeller


    正确答案： D
    解析： 暂无解析

  • 第24题：

    单选题
    A propeller of 5~65m in diameter, having a mean pitch of 4~88m, turning at 72 rpm, at a speed of 11 knots (339~79m/min), will give （） of apparent slip.
    A

    0~967

    B

    0~033

    C

    0~031

    D

    0~969


    正确答案： D
    解析： 暂无解析

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