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
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相关考题
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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 -
单项选择题
The quantity or condition which is measured and controlled is known as the （）
A.controlled variable
B.manipulated variable
C.set point
D.control point
