网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
参考答案
参考解析
解析：
暂无解析
更多 “单选题（） control system is one in which the control action is independent of the output.A Feed backB Negative feed backC Close loopD Open loop” 相关考题
考题
_______control system is one in which the control action is independent of the output.A.Feed backB.Negative feed backC.Close loopD.Open loop
考题
The control mode in which tile final control element is moved from one of two fixed positions to the other is known as______.A.dead band actionB.neutral zone actionC.rangeD.on-off action
考题
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 byA.the lack of a feedbackB.the presence of a feed backC.the lack of a computerD.the presence of a computer
考题
Which system should be supplied to obtain the best efficiency and lowest emissions?A.Lean combustion principleB.Fuel oil systemC.Electrical control systemD.Electronic control system
考题
You are experiencing contention in the queue on an egress interface of the router. Which policy action should be used for congestion control?()
A.markB.colorC.filterD.discard
考题
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
考题
Which three devices are used by the Cisco Wireless Control System （WCS） for wireless management？（）A、WLAN controllersB、WLAN Solution Engine （WLSE）C、Cisco Wireless Control System （WCS）D、Cisco Wireless Location ApplianceE、lightweight access point （AP）F、autonomous access point （AP）
考题
Which of the following is the correct signal flow for an analog multi-room audio system？（）A、Source，Volume Control，Speaker，AmpB、Source，Amp，Volume Control，SpeakerC、Amp，Source，Volume Control，SpeakerD、Speaker，Amp，Volume Control，Source
考题
Which of the following locations contains the System Restore option in Windows XP？（）A、Control Panel Administrative tools.B、Control Panel Security Center.C、System Properties， Start up and Recovery.D、Help and support from the Start menu.
考题
Which of the following sequences of steps can be used to increase the amount of virtual memory （page memory） available to Windows？（）A、Start Control Panel System Advanced tab Startup and Recovery Advanced tab Settings Advanced tabB、Start Control Panel System General tab Under Performance Settings Advanced tab C、Start Control Panel System Advanced tab Under Performance Settings Advanced tab D、Start Control Panel System Performance tab Under Performance Settings Advanced tab
考题
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 mandatoryB、specify action group ExecuteCommandActionGroup for Controller commandsC、specify action group ViewCommandActionGroup for View commandsD、specify resource group ControllerCommandResourceGroup for Controller commandsE、specify resource group ViewCommandResourceGroup for View commands
考题
Which one of the following provides the capability to partition the 3584 Tape Library into separatelogical libraries?（）A、Control Path Failover B、Enhanced Frame Control C、Advanced Library Management System D、High Availability Library Control
考题
You create a mobile Web application. You need to use a Command control to post user input from the UI elements back to the server. What are two possible ways to achieve this goal?（）A、Place the Command control within an instance of the System.Web.UI.MobileControls.SelectionList control.B、Place the Command control within an instance of the System.Web.UI.MobileControls.ObjectList control.C、Place the Command control within an instance of the System.Web.UI.MobileControls.Form control.D、Place the Command control within an instance of the System.Web.UI.MobileControls.Panel control.
考题
单选题Which of the following marine examples belongs to the open loop control system?（）A
Accommodation heating systemB
Steering gearC
Boiler controlD
Cargo control
考题
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 actionB
neutral zone actionC
rangeD
on-off action
考题
单选题In an automation system, the effect of a control action sensed by a controller is known as （）A
command inputB
set point signalC
outputD
feedback
考题
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
markB
colorC
filterD
discard
考题
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 positionB
Press the emergency stopC
Notify the mate on watchD
All of the above
考题
单选题Which of the following is less vulnerable to threats and attacks because it is not associated with one specific operating system？（）A
Cisco Voice and Video over VPNB
Cisco Secure Access Control ServerC
Cisco NAC ApplianceD
Cisco Threats Response
考题
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 coincideB
The periodic change between the set point and the control pointC
The variable difference between the set point and the control pointD
The constant difference between the set point and the control point
考题
单选题Which statement is true about the distributed call control in a VoIP network？（）A
the VoIP endpoints have the intelligence to set up and control callsB
Call setup and control functionality is centralized in one call agent or clusterC
Call setup and control resides in call agents that are distributed throughout the networkD
Each VoIP device has separate call control， voice packetization， and transport mechanisms
考题
单选题IBM Long Term File System (LTFS) benefits include which one of the following?（）A
management of the encryption keys B
partitioning of the library drives C
helps to control the write speed matching D
helps reduce tape, file management and archive costs
考题
多选题Which three devices are used by the Cisco Wireless Control System （WCS） for wireless management？（）AWLAN controllersBWLAN Solution Engine （WLSE）CCisco Wireless Control System （WCS）DCisco Wireless Location ApplianceElightweight access point （AP）Fautonomous access point （AP）
考题
单选题Which of the following is NOT one of the three details you need to fill in on the New Custom Control dialog？（）A
Name of the custom controlB
Comments to describe the custom controlC
List of the controls that will make up this custom controlD
Application that will contain the custom control
考题
单选题In （） the control action is independent on(of) the output.A
a closed loop control systemB
an open loop control systemC
a boiler control systemD
a steering gear control system
考题
单选题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
考题
单选题Which one of the following provides the capability to partition the 3584 Tape Library into separatelogical libraries?（）A
Control Path Failover B
Enhanced Frame Control C
Advanced Library Management System D
High Availability Library Control
热门标签
最新试卷