In ______ the control action is independent on the output.A.a closed loop control systemB.an open loop control systemC.a boiler control systemD.a steering gear control system

题目

In ______ the control action is independent on the output.

A.a closed loop control system

B.an open loop control system

C.a boiler control system

D.a steering gear control system

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更多“In ______ the control action is independent on the output.A.a closed loop control systemB. ”相关问题

  • 第1题：

    200 Start the turning gear， and with some one hand-operating the cylinder lubricators at regular intervals, and with the indicator cocks@,

    and with the control gear in theoposition, give the engine at least one complete turn

    A.open; stop

    B.closed, stop

    C.open; start

    D.closed: start


    答案：A

  • 第2题：

    第一组

    An automatic system usually consists of a control system and an information system. A control system is a system which measures the condition of some entity and, with the information, governs the state of a variable; i.e., speed, temperature, pressure, position, etc. The open-loop system is the simplest form. a control system may assume. It is distinguished from the closed-loop system by the lack of an input which measures the state of the controlled variable; such an input is called a feedback. In modern ships the open-loop system has practically disappeared and the closed-loop system which operates with a feed-back is extensively used. An information system serves the parallel function of monitoring system or plant performance. The monitoring function may serve a number of purposes; specifically it may indicate values of controlled variables to guide remote control operations, warn of off-limit conditions and provide record of performance. In many cases a visual and audible alarm may be provided to warn of off-limit conditions on board ship and, associated with this, the important variables will be recorded on demand. The automatic control system can be more sophisticated by incorporating digital-processing equipment, that is, a computer. This computer is usually fed with signals from all sensors. It scans the values of the sensors and generates alarm signals for off-limit conditions, acting as a super-supervisor. Sometimes, it can even make necessary and take the necessary action to optimize performance without human intervention.

    The closed-loop system differs from the open-loop system by

    A.the lack of a feedback

    B.the presence of a feed back

    C.the lack of a computer

    D.the presence of a computer


    正确答案：B

  • 第3题：

    The organization shall undertake change in a planned and systematic manner , taking account of the review of the potential consequences of changes and taking action as necessary , to ensure the integrity of goods and services are maintained . This is called( )

    A.Control of changes
    B.Control of plans
    C.Control of accounts
    D.Control of service

    答案：A
    解析：
    翻译：组织应按照计划和系统的方式进行变更，同时考虑到变更的潜在后果的审查并在必要时采取行动，以确保货物和服务的完整性得到维护。这被称为（ ）A．变更控制 B．控制计划C．控制账户 D．控制服务

  • 第4题：

    戴明“PDCA循环”不包括（）

    • A、 计划（Plan）
    • B、 实施（Do）
    • C、 控制（Control）
    • D、 处理（Action）

    正确答案:C

  • 第5题：

    A site administrator is configuring Command-level access control. Which of the following statements about Command-level access control are true？ Command level access control policies： （）

    • A、are mandatory
    • B、specify action group ExecuteCommandActionGroup for Controller commands
    • C、specify action group ViewCommandActionGroup for View commands
    • D、specify resource group ControllerCommandResourceGroup for Controller commands
    • E、specify resource group ViewCommandResourceGroup for View commands

    正确答案:A,B,E

  • 第6题：

    Which two file types must be included in a closed database backup taken with operating system commands？（）

    • A、data files
    • B、control file
    • C、password file
    • D、online redo log files
    • E、initialization parameter file

    正确答案:A,B

  • 第7题：

    单选题
    This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.
    A

    a manual closed loop

    B

    a manual opened loop

    C

    an automatic closed loop

    D

    an automatic opened loop


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    In an automation system, the effect of a control action sensed by a controller is known as （）
    A

    command input

    B

    set point signal

    C

    output

    D

    feedback


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    Which action(s) should the operator of a pedestal crane take if crane control is lost?（）
    A

    Let go of both control levers and return to neutral position

    B

    Press the emergency stop

    C

    Notify the mate on watch

    D

    All of the above


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    What level of control does a subflow have on the overall contact?（）
    A

    The subflow cannot call additional or nested subflows. 

    B

    The subflow cannot transfer the contact to another resource. 

    C

    The subflow has full contact control and can perform any action that the parent flow can perform.


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    In （）the control action is independent on the output.
    A

    a closed loop control system

    B

    an open loop control system

    C

    a boiler control system

    D

    a steering gear


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    （） control system is one in which the control action is independent of the output.
    A

    Feed back

    B

    Negative feed back

    C

    Close loop

    D

    Open loop


    正确答案： B
    解析： 暂无解析

  • 第13题：

    _______control system is one in which the control action is independent of the output.

    A.Feed back

    B.Negative feed back

    C.Close loop

    D.Open loop


    正确答案：D

  • 第14题：

    One important difference is that an ActiveX control must be(74) for a specific platform, while an applet is platform-independent.

    A．transactioned

    B．compiled

    C．created

    D．identitied


    正确答案：B
    解析：ActiveX控件和小应用程序(applet)之间的一个重要区别是，前者依赖某个特定的平台来编译，而后者是独立于这个特定平台的。

  • 第15题：

    闭环控制 ( closed loop control)


    正确答案: 凡是将系统的输出量反送至输入端，对系统的控制作用产生直接的影响，都称为闭环控制系统或反馈控制FeedbackControl系统。这种自成循环的控制作用，使信息的传递路径形成了一个闭合的环路，故称为闭环。

  • 第16题：

     What level of control does a subflow have on the overall contact?（）

    • A、The subflow cannot call additional or "nested" subflows. 
    • B、The subflow cannot transfer the contact to another resource. 
    • C、The subflow has full contact control and can perform any action that the parent flow can perform.

    正确答案:C

  • 第17题：

    Which statement is true about a NAT rule action of off？（）

    • A、The NAT action of off is only supported for destination NAT rule-sets.
    • B、The NAT action of off is only supported for source NAT rule-sets.
    • C、The NAT action of off is useful for detailed control of NAT
    • D、The NAT action of off is useful for disabling NAT when a pool is exhausted.

    正确答案:C

  • 第18题：

    单选题
    Which of the following marine examples belongs to the open loop control system?（）
    A

    Accommodation heating system

    B

    Steering gear

    C

    Boiler control

    D

    Cargo control


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
    A

    dead band action

    B

    neutral zone action

    C

    range

    D

    on-off action


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    You are experiencing contention in the queue on an egress interface of the router. Which policy action should be used for congestion control?（）
    A

    mark

    B

    color

    C

    filter

    D

    discard


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following definitions can be used to define the term ‘offset ’ as a characteristic of controller action?（）
    A

    The period of time in which the set point and the control point coincide

    B

    The periodic change between the set point and the control point

    C

    The variable difference between the set point and the control point

    D

    The constant difference between the set point and the control point


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    In （） the control action is independent on(of) the output.
    A

    a closed loop control system

    B

    an open loop control system

    C

    a boiler control system

    D

    a steering gear control system


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    戴明“PDCA循环”不包括（）
    A

     计划（Plan）

    B

     实施（Do）

    C

     控制（Control）

    D

     处理（Action）


    正确答案： D
    解析： 暂无解析

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