Describe computer-based control and control loops.
What will be an ideal response?
Today modern process has virtually no lag time and can operate facilities from a single control room over great distances. Recently, a group of instrument consultants in Hong Kong were able to open and close an automated valve located in a small pilot plant at a community college in Baytown Texas.
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A farmer started irrigating a soil some 10 years ago but in recent years yields have declined and the soil physical condition has deteriorated. Which of the following most likely accounts for this situation?
A) failure to use conservation tillage to reduce salt accumulation at the soil surface B) high SAR of the irrigation water C) high content of Ca and Mg in the irrigation water D) excessive drainage of the soil E) high gypsum content in the soil
An air conditioning performance check requires a ________
A) Manifold gauge set and a volt-ohmmeter B) Thermometer and a hydrometer C) Thermometer and a vacuum pump D) Thermometer and a manifold gauge set
The Karnaugh maps provide graphic approaches to simplifying Boolean expressions
Indicate whether the statement is true or false
Most programmable logic controllers (PLCs) contain a timer that runs continually when the PLC is in the RUN mode. What is the function of this timer?
What will be an ideal response?