An alarm system usually consists of motion detectors.____

Operation of the valve control release on a fixed CO2 system must immediately ______.

A.release CO2 to the protected space

B.secure all mechanical ventilation in the protected space

C.sound the rig’s general alarm signal for a fire

D.sound an alarm in the ballast control room

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

The(71) is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several(72). In a workflow system, a process is specified using the process definition tool. Usually, processes are defined in terms of a(73), which consists of(74) indicated using a circle, and(75) shown as a rectangle. These two components can be linked by means of a directed arc.

A．waterfall model

B．workflow reference model

C．evolutionary model

D．spiral model

A Database Management System(DBMS) consists of a collection of interrelated data and a collection of () to access to that data

A.programs

B.memory

C.space

D.password

The CO2 flooding system is actuated by a sequence of steps which are ______.

A.break glass, pull valve, break glass, pull cylinder control

B.sound evacuation alarm, pull handle

C.open bypass valve, break glass, pull handle

D.open stop valve, open control valve, trip alarm

Air cocks, usually positioned at the_______in a circulating system, is used to get rid of the air in the system.

A.bending joint

B.expansion tank

C.weld

D.the highest point

A comprehensive transportation system consists of ( ).

A. airports

B. railways

C. highways

D. water transportation

What alarm is NOT found on an inert gas system ________．

A.Low oxygen alarm

B.Low pressure alarm

C.Scrubber high water level alarm

D.Deck seal low water alarm