Which of the following is not true about PLCs?
A. They can communicate over various networks
B. They are designed to withstand harsh industrial environments
C. They were designed to replace relay logic
D. None of these are correct
Answer: D
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In the postwar South
A. the economy and social structure was utterly devastated. B. the emancipation of slaves had surprisingly little economic consequence. C. the much-feared inflation never materialized. D. industry and transportation were damaged, but southern agriculture continued to flourish. E. poorer whites benefited from the end of plantation slavery.
?What is the maximum temperature that the base metal can be at while it is being welded?
A. ?50°F (10°C) B. ?100°F (38°C) C. ?150°F (65°C) D. ?350°F (175°C)
Relay problems fall into the same two groups as switch problems, namely operators and contacts
Indicate whether the statement is true or false
Describe the four strokes of the internal combustion engine.
What will be an ideal response?