The biggest difference between a DCS and a PLC system is that many PLCs are _____
A) standalone B) expensive C) rack-mounted D) networked
A
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What type of units are required by the EPA to have service valves?
A) Type II only B) Type I only C) Types I, II, and III D) Type II and Type III
The fan and limit switch provides an operational control to energize the fan, and a safety circuit to de-energize the gas valve if the temperature gets too high
Indicate whether the statement is true or false
How does the APAD and ACPU system lubricate the compressor and components all year long?
A. They inject oil into the compressor inlet. B. They engage the compressor for 15 seconds after start up. C. They prevent the compressor from engaging in cold weather to keep all the oil within the compressor. D. APAD and ACPU's have nothing to do with the lubrication of compressors or system components.
The formula for total current in a parallel circuit is ____.
A. IT = IR1 = IR2 = IR3 ...= IRn B. IT = IR1 + IR2 + IR3 ...+ IRn C. 1/ IT = 1/IR1 + 1/IR2 + 1/IR3 ...+ 1/IRn D. IT = IR1 - IR2 - IR3 ...- IRn