Explain how process variables turn into displayable or usable information for a PLC.
What will be an ideal response?
In order for process information to be transmitted and made available for display and/or control, there will always be some type of signal conversion that will take place, and in most cases, more than one conversion.
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A. oxy-acetylene torch B. propane torch C. boiling water D. heat gun
The GPS system consists of how many satellites?
a. 40 c. 18 b. 36 d. 24
A diff-amp with two out-of-phase signal voltages applied to the two inputs is called:
A) phase inverter input. B) phase inverter output. C) differential output. D) differential input.
To provide accurate control under low-load conditions, the controlled device must be able to maintain stable flow at very low flow rates. Such a device is said to have good ____.
a. modulation b. variability c. machining d. rangeability