What would happen if a hydronic system was installed without an expansion tank?
What will be an ideal response?
When water is heated, it expands a great deal; if the expansion tank was not there, the relief valves would open and cause constant flooding.
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When coaching or counseling a worker who is performing at-risk behavior, a safety technician should _____.
a. invite the rest of the work crew to participate in the coaching session b. publicly scold the worker for putting others at risk c. ask the worker to identify which of his or her behaviors was risky d. be prepared to explain the proper way to do the job
A plumb bob being set up over a point should be suspended over the point with a clearance of _____.
a. less than 1/4 inch b. 1/4 inch to 1/2 inch c. 3/8 inch to 5/8 inch d. at least 3/4 inch
In a dc circuit operating in steady state (transients already gone), a capacitor behaves like
A. an open circuit B. a resistor C. a closed (short) circuit D. an inductor E. a current source
Which of the following statements on PLC 5 and SLC 500 status operation is NOT true?
A) Program errors can change status data values. B) PLC instructions can change status data values. C) Status data cannot be used by instructions for logical control. D) The first pass bit status address is S:1/15.