?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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Terrariums are plants growing inside a glass or plastic container
Indicate whether the statement is true or false
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?
? Box temperature 30° ? Suction pressure 20 psig LOW Evaporator temperature (-15°) ? Suction line leaving the evaporator is 20° HIGH Superheat (35°) ? Ambient temperature is 70° ? Head pressure is 190 psig LOW (85° condensing temp means 15° condenser split) ? The liquid line is 75°. NORMAL subcooling (10°) a. The unit is low on refrigerant or the ambient is too cold. b. There is a restriction in the liquid line or the expansion valve. c. The head pressure control is not operating on the condenser. d. The evaporator is dirty, iced up, or there is an evaporator fan problem.
Which of the following is not a device-specific rating with regard to an optoisolator?
A) Isolation junction capacitance B) Isolation resistance C) Isolation current D) Isolation source voltage