When charging systems with zeotropic refrigerants, such as R410A, the refrigerant must leave the refrigerant cylinder:
A) As a liquid. B) As a vapor.
C) Under a pressure of at least 100 psig. D) As a liquid-vapor mixture.
A
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The difference between the plug and slot weld is in the ____ of the hole in which the weld metal is deposited to fuse the two members of the joint.
A. depth B. size C. location D. shape
How does air flow in a standing-pilot, natural-draft system?
A) It relies on heat to pull air into the combustion chamber and a fan to remove flue gases. B) It relies on heat to increase the buoyancy of the air to pull air into the combustion chamber and force flue gases into the proper vent. C) It relies on a fan to pull the air into the combustion chamber and blow flue gases out. D) It relies on heat to decrease the convection of the air to pull air into the combustion chamber and force flue gases into the proper vent.
A set of construction documents that show how the construction was actually performed are known by the name _____________________.