Define critical point.
A) The pressure and temperature where a solid and a liquid have the same properties
B) The pressure and temperature where a substance can exist simultaneously as a solid, a liquid, and a gas in thermal equilibrium
C) The pressure and temperature at which gas and liquid have the same properties
D) The pressure and temperature above which a substance will cease to exist
[Ques. 2] The substance used to compare the specific gravity of gases is:
A) Helium. B) Nitrogen. C) Air. D) Oxygen.
[Ques. 3] Before assembling a PD meter, technicians should make sure they study manual schematics and ________ closely.
A) tracings B) blueprints C) line drawings D) P&I charts
[Ques. 4] Types of pressure vessels commonly used in HVACR include which of the following? (You may select more than one.)
A) Oil storage tank B) Refrigerant cylinder C) Boiler
D) Receiver E) Gasoline storage tank F) Accumulator
[Ques. 5] Pressure vessels such as boilers should have a placard on or near the vessel that displays:
A) The manufacturing date and type of material the vessel is made of.
B) The parts per million casting impurities and the alloy shear strength.
C) When it was inspected and when the next inspection should be.
D) The material the vessel is made of and the name of the inspector.
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