ANESTHESIA MACHINE QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2025-2026
Identify the components of the low pressure system in the anesthesia machine (select 2)
a. cylinder pressure regulator
b. Oxygen flush valve
c. Flowmeter tubes
d. common gas outlet - Answers c. Flowmeter tubes
d. common gas outlet
High pressure: cylinder pressure regulator
intermediate pressure: oxygen flush valve
Match the following examples of anesthesia machine/circuit components to their proper
location in the SPDD model
1) Disposal a) Cylinder
2) Delivery b) Vaporizer
3) Supply c) Circle system
4) Processing d) Scavenger - Answers Disposal= scavenger
Delivery= circle system
Supply= cylinder
Processing= vaporizer
The PISS system is used to:
a. prevent the use of wrong gas hose
b. diagram the pathway of gas through the anesthesia machine
c. filter & exchange air in the OR
,d. prevent the use of the wrong gas cylinder - Answers d. prevent the use of the wrong gas
cylinder
The pin index safety system (PISS) prevents wrong cylinder from being attached to anesthesia
machine.
The diameter index safety system (DISS) prevents the wrong gas hose from being attached to
the anesthesia machine
SPDD model describes the pathway of gas through the anesthesia machine
Filtering & exchanging air in the OR is not a function of the anesthesia machine
The bourdon pressure gauge on an oxygen cylinder reads 500psi. If the flow rate is 2L/min, how
long will this cylinder provider O2 o the patient. (enter minutes & round to nearest whole number)
- Answers 83-87
(660L/1900psi)=conversion factor
500 x conversion factor / 2L per min= 86.4 min
Identify the best practices for handling gas cylinders (select 2)
a. removing the plastic over on the port when installing the cylinder
b. placing 2 washers between the cylinder & the hanger yoke
c. oiling cylinder valves every 6 months
d. laying the cylinder on its side when changing the cylinder on the anesthesia machine -
Answers a. removing the plastic over on the port when installing the cylinder
d. laying the cylinder on its side when changing the cylinder on the anesthesia machine
Under normal circumstances, gas cylinders must be stored in upright position and secured.
, When changing the cylinder on the anesthesia machine, it is appropriate to temporarily place the
old cylinder on its side until it can be moved to its appropriate storage receptacle.
you should remove the plastic over from the port before installing the cylinder. failure to do so
may obstruct gas flow when the cylinder is turned on
oiling the cylinder valve increases risk of fire by combining O2 & N2O with oil.
If there is a leak after you install a cylinder, do not be tempted to place more than one washer
b/t the cylinder & the hanger yoke assembly. This may bypass the PISS & allow the wrong
cylinder to be matched up with the wrong hander yoke assembly
The oxygen pressure failure device activates when the: (select 2)
a. FiO2 in the inspiratory limb is less than 21%
b. oxygen pressure in the supply line is less than 20 psi
c. oxygen pipeline crossover with N2O
d. oxygen tank is exhausted - Answers b. oxygen pressure in the supply line is less than 20 psi
d. oxygen tank is exhausted
The oxygen pressure failure device monitors O2 pressure (not concentration). It activates when
O2 pressure in the intermediate pressure system falls below 20 psi. By contrast, the O2 analyzer
monitors O2 [ ] in the low pressure system. It alarms when the FiO2 falls below 21%
If pipeline pressure fails, the auxiliary O2 tank is open, the O2 pressure failure device won't
activate until O2 pressure from tank is < 20 psi. This explains why you don't want to leave O2
cylinder open if not using it.
Hypoxia prevention safety device on the anesthesia machine will:
a. prevent a hypoxic mixture if a third gas is used
Identify the components of the low pressure system in the anesthesia machine (select 2)
a. cylinder pressure regulator
b. Oxygen flush valve
c. Flowmeter tubes
d. common gas outlet - Answers c. Flowmeter tubes
d. common gas outlet
High pressure: cylinder pressure regulator
intermediate pressure: oxygen flush valve
Match the following examples of anesthesia machine/circuit components to their proper
location in the SPDD model
1) Disposal a) Cylinder
2) Delivery b) Vaporizer
3) Supply c) Circle system
4) Processing d) Scavenger - Answers Disposal= scavenger
Delivery= circle system
Supply= cylinder
Processing= vaporizer
The PISS system is used to:
a. prevent the use of wrong gas hose
b. diagram the pathway of gas through the anesthesia machine
c. filter & exchange air in the OR
,d. prevent the use of the wrong gas cylinder - Answers d. prevent the use of the wrong gas
cylinder
The pin index safety system (PISS) prevents wrong cylinder from being attached to anesthesia
machine.
The diameter index safety system (DISS) prevents the wrong gas hose from being attached to
the anesthesia machine
SPDD model describes the pathway of gas through the anesthesia machine
Filtering & exchanging air in the OR is not a function of the anesthesia machine
The bourdon pressure gauge on an oxygen cylinder reads 500psi. If the flow rate is 2L/min, how
long will this cylinder provider O2 o the patient. (enter minutes & round to nearest whole number)
- Answers 83-87
(660L/1900psi)=conversion factor
500 x conversion factor / 2L per min= 86.4 min
Identify the best practices for handling gas cylinders (select 2)
a. removing the plastic over on the port when installing the cylinder
b. placing 2 washers between the cylinder & the hanger yoke
c. oiling cylinder valves every 6 months
d. laying the cylinder on its side when changing the cylinder on the anesthesia machine -
Answers a. removing the plastic over on the port when installing the cylinder
d. laying the cylinder on its side when changing the cylinder on the anesthesia machine
Under normal circumstances, gas cylinders must be stored in upright position and secured.
, When changing the cylinder on the anesthesia machine, it is appropriate to temporarily place the
old cylinder on its side until it can be moved to its appropriate storage receptacle.
you should remove the plastic over from the port before installing the cylinder. failure to do so
may obstruct gas flow when the cylinder is turned on
oiling the cylinder valve increases risk of fire by combining O2 & N2O with oil.
If there is a leak after you install a cylinder, do not be tempted to place more than one washer
b/t the cylinder & the hanger yoke assembly. This may bypass the PISS & allow the wrong
cylinder to be matched up with the wrong hander yoke assembly
The oxygen pressure failure device activates when the: (select 2)
a. FiO2 in the inspiratory limb is less than 21%
b. oxygen pressure in the supply line is less than 20 psi
c. oxygen pipeline crossover with N2O
d. oxygen tank is exhausted - Answers b. oxygen pressure in the supply line is less than 20 psi
d. oxygen tank is exhausted
The oxygen pressure failure device monitors O2 pressure (not concentration). It activates when
O2 pressure in the intermediate pressure system falls below 20 psi. By contrast, the O2 analyzer
monitors O2 [ ] in the low pressure system. It alarms when the FiO2 falls below 21%
If pipeline pressure fails, the auxiliary O2 tank is open, the O2 pressure failure device won't
activate until O2 pressure from tank is < 20 psi. This explains why you don't want to leave O2
cylinder open if not using it.
Hypoxia prevention safety device on the anesthesia machine will:
a. prevent a hypoxic mixture if a third gas is used
