Fixed orifice flowmeters operate by:
A) the orifice size determining gas flow
B) the pressure set proximal to the orifice determining gas flow
C) the venturi principle
D) balancing pressures across a proportioning valve
Q. 2 When using a Bourdon gauge flowmeter, it is important to:
A) only operate it in the upright position
B) only operate it when you can see the gauge
C) be certain all tubing is free of kinks or obstructions
D) adjust the inlet pressure to 50 psi prior to the single-stage reducing valve entrance
Q. 3 In the presence of back pressure, a Bourdon gauge flowmeter will:
A) not be affected
B) read higher than the actual flow delivered
C) read lower than the actual flow delivered
D) none of the above
Q. 4 Advantages of a Bourdon gauge flowmeter include which of the following?
I. It is very compact.
II. It works in any position.
III. It is accurate in the presence of back pressure.
IV. It is back-pressure compensated.
A) I
B) I and II
C) I, II, and III
D) I, II, III, and IV
Q. 5 Prior to gas entering the proportioning valve of an air-oxygen blender, it is important that:
A) air and oxygen pressure are equal
B) a two-stage reducing valve is connected to the blender's inlet
C) a single-stage reducing valve is connected to the blender's inlet
D) that both gas inlets are connected to oxygen
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