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 valves of a CO2 system may be located within the protected space when().
A
it is impractical to locate them outside
B
there is also a control valve outside
C
the CO2 cylinders are also in the space
D
an automatic heat-sensing trip is installed
参考答案
参考解析
解析:
暂无解析
更多 “单选题Control valves of a CO2 system may be located within the protected space when().A it is impractical to locate them outsideB there is also a control valve outsideC the CO2 cylinders are also in the spaceD an automatic heat-sensing trip is installed” 相关考题
考题
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A.Pressure-reducing valveB.Unloading valveC.Counterbalance valveD.Pressure-relief valve
考题
●An Embedded System is a (72)designed for specific control functions within a larger system.(72) A. computerB. programC.computer systemD.tool
考题
Operation of the valve control release on a fixed CO2 system must immediately ______.A.release CO2 to the protected spaceB.secure all mechanical ventilation in the protected spaceC.sound the rig’s general alarm signal for a fireD.sound an alarm in the ballast control room
考题
Before performing any maintenance on a hydraulic system storing energy in an accumulator, you shouldA.pressurize the system to test for leaksB.bleed off all pressure within the systemC.operate the machine until it reaches normal temperatureD.disconnect the pump pressure control switch
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
Where normal delivery at the port of destination is prevented by some cause beyond the control of the master,and the master may and must deal with the cargo for the benefit of its owners by landing it,carrying it,or transshipping it,as may seem best,the Shipowner may then charge the cargo owners with ______ to cover the expenses thus incurred in their interests.A.pro rata freightB.advance freightC.dead freightD.back freight 答案
考题
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited ________.A.It is required on all vesselsB.It may be located in a conspicuous place in the wheelhouseC.It may be located at the bilge and ballast pump control stationD.All of the above
考题
Valves on steam-smothering lines to cargo tanks shall be set with ______.A.The master control valve shut and valves to individual cargo tanks shutB.The master control valve open and valves to individual cargo tanks shutC.The master control valve shut and valves to individual cargo tanks openD.All valves open
考题
Which of the following allows verification of the port that a printer is currently using?()A、The print queue window from system trayB、Properties of the printer from the Printers Control PanelC、Print spooler view in the Printers Control PanelD、Properties of the port within Device Manager
考题
Within a 64-bit Windows desktop OS, by default where are the program files for 32-bit programs located?()A、C:/WindowsB、C:/Program Files (x86)C、C:/Program FilesD、C:/Windows/System32
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If plastic film insulation becomes damaged in air conditioning system, () may form within the film.A
evaporationB
condensationC
liquefiesD
vaporization
考题
单选题Which of the valves listed is NOT considered to be a hydraulic system directional control valve?()A
Spring-centered valveB
Unloading valveC
Three-position valveD
Two-position valve
考题
单选题Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in () position.A
neutralB
endC
openingD
closure
考题
单选题Operation of the valve control release on a fixed CO2 system must immediately().A
release CO2 to the protected spaceB
secure all mechanical ventilation in the protected spaceC
sound the rig's general alarm signal for a fireD
sound an alarm in the ballast control room
考题
单选题Which of the following allows verification of the port that a printer is currently using?()A
The print queue window from system trayB
Properties of the printer from the Printers Control PanelC
Print spooler view in the Printers Control PanelD
Properties of the port within Device Manager
考题
单选题In setting the valves on a steam-smothering system on a tank vessel,the master control valve to cargo tanks should be().A
open and individual tank valves openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
考题
单选题Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited().A
It is required on all vesselsB
It may be located in a conspicuous place in the wheelhouseC
It may be located at the bilge and ballast pump control stationD
All of the above
考题
单选题A fire pump may be used for other purposes if().A
the other services are run off a reducing station with a pressure gageB
one of the required pumps is kept available for use on the fire main system at all timesC
no relief valves are installedD
all of the above conditions are met
考题
单选题In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must().A
actuate an alarm and open the engine room control valveB
actuate an alarm and open the engine room CO2 releasing valveC
open the engine room control valve and shut off engine room ventilation fansD
open the engine room control valve and then the CO2 releasing valve
考题
单选题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the()A
double bottom fuel oil tank temperatureB
heater supply steam flowC
pressure of the fuel supplied to the burnersD
attemperator steam flow in the heater discharge circuit
考题
单选题Two navigational hazards are located near to each other,but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by().A
the differing light colorsB
one system having odd numbers while the other system has even numbersC
one system using horizontal bands while the other system uses vertical stripesD
the difference in the periods of the light
考题
单选题Compensated flow control or constant flow valves are used in hydraulic systems to()A
compensate for major leaks in the systemB
maintain the original fluid viscosityC
allow for changes in pressure and temperature within the systemD
assure constant fluid temperature
考题
单选题Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the ().A
cooling water pumpB
nozzle cooling passagesC
cylinder jacketsD
heat exchanger
考题
单选题If you change from a low pour point lubricant to a high pour point lubricant in a refrigeration system, ().A
compressor lubrication will be improvedB
oil will not leave the crankcaseC
compressor valves will be damagedD
oil may congeal in the evaporator
考题
单选题In setting the valves on a steam-smothering system on a tanker,the master control valve to cargo tanks should be().A
open and individual tank valves openB
open and the individual tank valves closedC
closed and the individual tank valves closedD
closed and the individual tank valves open
考题
单选题While on watch in the engine room, you hear a continuous sounding of the general alarmWhich of the following actions should you take FIRST?()A
Secure the burners then proceed to your assigned boat stationB
Start the fire pump and establish flow to the fire mainC
Open the guardian valve and standby to maneuverD
Open the master control valves on the fixed CO2 system
热门标签
最新试卷