A biflow expansion valve:
A) Is designed to allow refrigerant flow in both directions.
B) Can be used with two different refrigerants.
C) Has both a low flow and a high flow setting.
D) Provides flow out of two ports simultaneously, eliminating the need for a refrigerant distributor.
[Ques. 2] The advantage of ball valves over other types of manual refrigeration valves is that they:
A) Have integral ports that allow pressure drop measurements.
B) Normally require special tools to open, preventing tampering by untrained personnel.
C) Have venturi jets that help offset the pressure loss through the valve.
D) Offer less resistance to flow.
[Ques. 3] What are the two basic types of relief valves used on refrigeration systems?
A) An automatic relief valve and a one-time relief valve
B) Electrically operated and pneumatically operated
C) A high-side pressure relief valve and a low-side pressure relief valve
D) System mounted and remote mounted
[Ques. 4] Why might adjusting the oxygen flow during a brazing project by standing in front of the cylinder and slowly opening the valve all the way create a hazardous situation?
A) The valve should only be opened halfway.
B) The valve should only be opened two-and-a-half turns.
C) The valve should be opened while standing behind the cylinder.
D) The valve should be opened quickly to relieve pressure.
[Ques. 5] What type of thread lubricant should be used when connecting the oxygen regulator to the oxygen cylinder?
A) Teflon tape
B) Only nonflammable packing
C) Light-weight machine oil
D) No lubricant or sealant of any kind should be used.
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