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单选题
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
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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
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单选题The system administrator did a new install of AIX on a server about a week ago. The system was not rebooted after the installation. CDE is running on this system as is TCPIP. The system administrator has started configuring the system percompany directives. The power cable was inadvertently disconnected from the wall causing the sever to lose power. Upon reboot, the system appears to hang during log in from the console or from Xterminals. Which of the following is the most probable cause?（）A
It is a hardware problem caused by the power failure.B
There is a network problem, most probably with name resolution.C
Sine the system was never rebooted, devices are marked defined instead of available and need to be activated.D
Some filesets may be marked as broken and need to be reinstalled.
考题
单选题Purging air from a hydraulic system is necessary when（）A
adding small amounts of oil to the systemB
the system has been overheatedC
the system has been drained and then filled with new oilD
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单选题In a hydraulic system, （） are used to protect the system from over pressure.A
stop valvesB
check valvesC
safety valvesD
reducing valves
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单选题Remote control means that （）.A
the system is manned manuallyB
the system is situated remotely from the operatorC
the system is controlled automaticallyD
all the above
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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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）A
purge lube oil from the liquid refrigerantB
recover water purged from the systemC
separate foul gases from the receiverD
purge non-condensable gases without losing refrigerant
考题
单选题Remote control means that the system is being controlled by the operator who is situated （） from the system.A
automaticB
localC
remoteD
manual
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