单项选择题
Restrictions occurring in the small orifices of pneumatic control system components can be used by （）
A.moisture in the compressed air supply
B.excessive dryness in the compressed air supply
C.pressure surging in the compressed air receiver
D.insufficient lubrication of the system components
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相关考题
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单项选择题
In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.
A.reset action
B.proportional action
C.two position action
D.rate action -
单项选择题
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 -
单项选择题
The value of the controlled variable, which under any fixed set of conditions the automatic controller operates to maintain, is known as （）
A.set point
B.control point
C.deviation
D.offset
