What does an evaporator pressure regulator do?
A) It will not allow the evaporator pressure to rise above its setpoint, even if the suction pressure is higher.
B) Evaporator pressure regulator is simply another name for thermostatic expansion valve.
C) It is used in place of a more traditional refrigerant expansion device.
D) It will not allow the evaporator pressure to drop below its setpoint, even if the suction pressure is lower.
Question 2
Why are air-acetylene, air MAPP, or air-propane torches preferred over oxyacetylene torches for soldering copper pipes?
A) Oxyacetylene temperatures can easily overheat the pipe.
B) They have smaller, more focused flames than oxyacetylene torches.
C) They all produce a much hotter flame than oxyacetylene torches.
D) Oxyacetylene torches cannot be used with solder because of the possibility of adverse chemical reactions.
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