?When inspecting valves from the valve body: Technician A says the edges of the spools should be damage-free but should not be sharp.Technician B says to identify a bent valve, install it into its bore and rotate it. If it binds or drags while it is being rotated, it is bent.Who is correct?

A. ?A only
B. ?B only
C. ?Both A and B
D. ?Neither A nor B


Answer: C

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1. A walk-in freezer using R404A has the following conditions. Which of the groups of choices is the most logical explanation for the problem?

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Which of the following is not a device-specific rating with regard to an optoisolator?

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