Anesthesia Equipment Chapter 5 Flashcards
end of chapter questions
The high pressure system of the anesthesia machine includes:
the hanger yokes
The Pin Index Safety System:
has specific locations for pins and holes for each gas
When placing a cylinder in the yoke:
the first step is to fully retract the retaining screw
the PISS components must be mated
The pressure regulator:
supplies a relatively constant outlet pressure while the source pressure is reduced
can be either direct or indirect acting
The intermediate pressure system includes:
the pipeline pressure gauge
the oxygen flush
The oxygen failure safety valve:
may or may not cut off the flow of air if the oxygen supply fails
The oxygen supply pressure alarm will:
be activated by a disconnected oxygen pipeline hose
be activated if the oxygen pipeline pressure is low
The oxygen flush valve:
must be protected against accidental activation
Which of the following statements about flowmeters are correct?
A. Parallel flowmeters are used in new anesthesia machines
B. Flowmeter tubes work on the principle of the variable orifice
C. The inside of a flow tube containing a ball is smooth
D. The pressure drop across the indicator is constant for all positions in the tube
B and D
B. Flowmeter tubes work on the principle of the variable orifice
D. The pressure drop across the indicator is constant for all positions in the tube
The rate of flow through a flowmeter tube depends on:
the pressure drop across the constriction
the size of the annular opening
the physical properties of the gas
If a flowmeter tube is broken:
the tube, indicator, and scale must be replaced as a unit
Effects of the physical characteristics of the gas passing through the flowmeter include:
at low flows, flow is a function of the viscosity of the gas
viscosity of the gas is more important with a longer and narrower constriction
with high flows, flow depends more on the density of the gas
the density of the gas is more important with a shorter and wider constriction
Correct statements concerning the order of flowmeter tubes include:
a leak in the flowmeter that is farthest from the manifold outlet may result in loss of gas from the middle flowmeter
the oxygen flowmeter should be next to the manifold outlet
Concerning mandatory minimum oxygen flow:
it is sometimes associated with an alarm
Correct statements concerning the minimum oxygen ratio control include:
if the flow of nitrous oxide is increased, the oxygen flow is automatically increased with a mechanical linkage
the gases are independently controlled when the oxygen percentage is above the minimum
it can be a mechanical or pneumatic link
