ANESTHESIA MACHINE AND EQUIPMENT
COMPREHENSIVE STUDY GUIDE 2026
◉ The oxygen flow rate necessary to prevent rebreathing of exhaled
gases with an Ayre's T piece is
a. 0.5 L/min
b. 1 L/min
c. 2 L/min
d. greater than 1.5 times the minute ventilation.
Answer: d. greater than 1.5 times the minute ventilation
◉ A half full tank of nitrous oxide gas has a
pressure of
a. 375 psi
b. 2200 psi
c. 750 psi
d. 50 psi.
Answer: c. 750 psi
◉ Precision vaporizers, such as those used for isoflurane, work
correctly when placed
a. in the circle
,b. out of the circle
c. either in or out of the circle
d. in the high-pressure portion of the anesthetic machine.
Answer: b. out of the circle
◉ If the unidirectional valves are missing from an anesthetic
machine, it is
a. okay to use the machine until you find them
b. okay to use the machine if soda lime is new
c. okay to use the machine with the pop off valve closed
d. definitely not okay to use the machine, except with a non
rebreathing circuit.
Answer: d. definitely not okay to use the machine, except with a non
rebreathing circuit
◉ The oxygen flush valve
a. allows oxygen to flow into the breathing system without going
through the vaporizer
b. increases the anesthetic concentration within the circuit
c. causes the patient to breathe deeper
d. is used primarily to keep the reservoir bag deflated.
Answer: a. allows oxygen to flow into the breathing system without
going through the vaporizer
, ◉ The advantages of a nonrebreathing system, as compared with a
circle breathing system, include all of the following, except
a. reduced resistance to breathing
b. greater potential for hypothermia caused by high flows needed
c. reduced mechanical dead space
d. no soda lime required.
Answer: b. greater potential for hypothermia caused by high flows
needed
◉ The minimum fresh gas flow in a semiclosed system is correctly
determined by the
a. patients metabolic rate
b. patients respiratory rate
c. drugs used for premedication
d. size of the soda lime canister.
Answer: a. patients metabolic rate
◉ All inhalant anesthetic machines should have
a. a nitrous oxide flowmeter
b. blood pressure monitors
c. respiratory monitors
COMPREHENSIVE STUDY GUIDE 2026
◉ The oxygen flow rate necessary to prevent rebreathing of exhaled
gases with an Ayre's T piece is
a. 0.5 L/min
b. 1 L/min
c. 2 L/min
d. greater than 1.5 times the minute ventilation.
Answer: d. greater than 1.5 times the minute ventilation
◉ A half full tank of nitrous oxide gas has a
pressure of
a. 375 psi
b. 2200 psi
c. 750 psi
d. 50 psi.
Answer: c. 750 psi
◉ Precision vaporizers, such as those used for isoflurane, work
correctly when placed
a. in the circle
,b. out of the circle
c. either in or out of the circle
d. in the high-pressure portion of the anesthetic machine.
Answer: b. out of the circle
◉ If the unidirectional valves are missing from an anesthetic
machine, it is
a. okay to use the machine until you find them
b. okay to use the machine if soda lime is new
c. okay to use the machine with the pop off valve closed
d. definitely not okay to use the machine, except with a non
rebreathing circuit.
Answer: d. definitely not okay to use the machine, except with a non
rebreathing circuit
◉ The oxygen flush valve
a. allows oxygen to flow into the breathing system without going
through the vaporizer
b. increases the anesthetic concentration within the circuit
c. causes the patient to breathe deeper
d. is used primarily to keep the reservoir bag deflated.
Answer: a. allows oxygen to flow into the breathing system without
going through the vaporizer
, ◉ The advantages of a nonrebreathing system, as compared with a
circle breathing system, include all of the following, except
a. reduced resistance to breathing
b. greater potential for hypothermia caused by high flows needed
c. reduced mechanical dead space
d. no soda lime required.
Answer: b. greater potential for hypothermia caused by high flows
needed
◉ The minimum fresh gas flow in a semiclosed system is correctly
determined by the
a. patients metabolic rate
b. patients respiratory rate
c. drugs used for premedication
d. size of the soda lime canister.
Answer: a. patients metabolic rate
◉ All inhalant anesthetic machines should have
a. a nitrous oxide flowmeter
b. blood pressure monitors
c. respiratory monitors
