Name two materials that are commonly used to provide or increase the fire -resistance rating of assemblies.
What will be an ideal response?
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The valve body bores are being discussed: Technician A says the bores should be measured with small bore (hole) gauges. Technician B says the bores only need to be cleaned if the damage to the valves can be corrected by polishing. Who is correct?
A. A only C. Both A and B B. B only D. Neither A nor B
Constant-air-volume systems can deliver different levels of heating or cooling:
A) By using variable-air-volume mixing boxes. B) By reheating the cool air with strip heat. C) By varying the speed of the constant-volume blower. D) By blocking registers in rooms that are not being used.
Another name for the feed reverse lever is: lead screw direction control lever
Indicate whether the statement is true or false
_________________ are devices activated by contact with an object that changes the state of its contacts when the object exerts a certain amount of force.
A. Limit switches B. Inductive proximity switches C. Photoelectric proximity switches D. Hall effect sensors