Anesthesia Technician (Certified)
CERTIFIED ANESTHESIA TECHNICIAN (CER.A.T.) | EXAM QUESTIONS
AND CORRECT ANSWERS | VERIFIED ANESTHESIA TECHNOLOGY
LATEST 2026/2027
ANESTHESIA TECHNICIAN (CERTIFIED)
1. Which safety feature of the anesthesia machine helps prevent
delivery of a hypoxic gas mixture when nitrous oxide is being used?
A. Adjustable pressure-limiting valve
B. Scavenging interface
C. Oxygen ratio proportioning system
D. Pin Index Safety System
C. Oxygen ratio proportioning system The proportioning system links
nitrous oxide flow to oxygen flow so the delivered oxygen concentration
cannot fall below about 25%.
2. The oxygen failure protection (fail-safe) device is triggered by a drop
in which of the following?
A. Vaporizer output concentration
B. Airway pressure in the circuit
C. Scavenging system vacuum
D. Oxygen supply pressure
D. Oxygen supply pressure When oxygen supply pressure falls, the
device reduces or shuts off the flow of other gases so the patient does
not receive a hypoxic mixture.
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, Anesthesia Technician (Certified)
3. What is the approximate pressure of medical gases delivered from
the hospital pipeline to the anesthesia machine?
A. 50 psi
B. 15 psi
C. 150 psi
D. 2000 psi
A. 50 psi Pipeline gases are supplied at roughly 50 psi, while full
oxygen cylinders sit near 2000 psi.
4. The first-stage regulator on an anesthesia machine cylinder yoke
reduces cylinder pressure to approximately what value?
A. 5 psi
B. 45 psi
C. 100 psi
D. 500 psi
B. 45 psi Cylinder pressure is stepped down to about 45 psi so it stays
just below pipeline pressure and the pipeline is used first.
5. The Pin Index Safety System is designed to prevent which of the
following errors?
A. Attaching the wrong gas cylinder to a yoke
B. Connecting the wrong hose to a wall outlet
C. Filling a vaporizer with the wrong agent
D. Reversing the inspiratory and expiratory valves
A. Attaching the wrong gas cylinder to a yoke Pin positions on the
yoke must match holes on the cylinder valve, so only the correct gas
cylinder can be seated.
6. The Diameter Index Safety System (DISS) applies to which
connections?
A. Vaporizer filling ports
B. Cylinder yoke connections
C. Non-interchangeable pipeline and hose connections
D. Breathing circuit 22 mm fittings
C. Non-interchangeable pipeline and hose connections DISS uses
gas-specific threaded fittings of differing diameters so hoses cannot be
attached to the wrong gas inlet.
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, Anesthesia Technician (Certified)
7. In the United States, which color is the standard code for an oxygen
cylinder?
A. Blue
B. Green
C. Yellow
D. Black
B. Green Oxygen is green, nitrous oxide is blue, medical air is yellow,
and nitrogen is black.
8. A full nitrous oxide cylinder stays at about 745 psi until nearly
empty. What explains this?
A. The gas is compressed to a fixed volume
B. A regulator inside the valve holds pressure steady
C. Nitrous oxide is stored as a solid
D. The contents are mostly liquid, so pressure reflects vapor pressure
D. The contents are mostly liquid, so pressure reflects vapor
pressure Because liquid N2O is vaporizing, pressure stays constant
until the liquid is gone, so the gauge does not show remaining volume.
9. When reading a flowmeter that uses a bobbin-type float, where
should the reading be taken?
A. At the bottom of the bobbin
B. At the widest point in the middle
C. At the tube's upper end cap
D. At the top of the bobbin
D. At the top of the bobbin A bobbin is read at the top edge, whereas
a ball float is read at its center.
10. Which valve delivers a high flow of pure oxygen directly to the
common gas outlet, bypassing the vaporizers?
A. Adjustable pressure-limiting valve
B. Check valve
C. Pressure relief valve
D. Oxygen flush valve
D. Oxygen flush valve The flush valve supplies about 35 to 75 L/min
of oxygen without passing through the vaporizer.
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, Anesthesia Technician (Certified)
Section 2: Machine Checkout and Leak Testing
11. A low-pressure system leak test is intended to detect leaks in which
part of the anesthesia machine?
A. Between the pipeline inlet and the regulators
B. Inside the ventilator bellows housing
C. Between the flowmeters and the common gas outlet
D. In the scavenging transfer tubing
C. Between the flowmeters and the common gas outlet The low-
pressure circuit lies downstream of the flowmeters, so it is tested to the
common gas outlet.
12. During a standard circuit pressure test, the circuit is pressurized to
what value with the Y-piece occluded and the APL valve closed?
A. 5 cm H2O
B. 30 cm H2O
C. 60 cm H2O
D. 100 cm H2O
B. 30 cm H2O The pressure should reach about 30 cm H2O and hold
steady for at least 10 seconds.
13. Which piece of backup equipment must be confirmed available
before every anesthetic?
A. A spare vaporizer
B. A second scavenging unit
C. A self-inflating resuscitation bag
D. An extra CO2 absorber canister
C. A self-inflating resuscitation bag A manual bag with a mask is
needed in case the machine or gas supply fails.
14. To calibrate an oxygen analyzer, the sensor is exposed to which
gas?
A. 100% oxygen only
B. Nitrous oxide at 50%
C. Room air at 21% oxygen
D. Nitrogen at 100%
C. Room air at 21% oxygen Room air is 21% oxygen, and a 100%
oxygen check is used as the second calibration point.
Page 4
CERTIFIED ANESTHESIA TECHNICIAN (CER.A.T.) | EXAM QUESTIONS
AND CORRECT ANSWERS | VERIFIED ANESTHESIA TECHNOLOGY
LATEST 2026/2027
ANESTHESIA TECHNICIAN (CERTIFIED)
1. Which safety feature of the anesthesia machine helps prevent
delivery of a hypoxic gas mixture when nitrous oxide is being used?
A. Adjustable pressure-limiting valve
B. Scavenging interface
C. Oxygen ratio proportioning system
D. Pin Index Safety System
C. Oxygen ratio proportioning system The proportioning system links
nitrous oxide flow to oxygen flow so the delivered oxygen concentration
cannot fall below about 25%.
2. The oxygen failure protection (fail-safe) device is triggered by a drop
in which of the following?
A. Vaporizer output concentration
B. Airway pressure in the circuit
C. Scavenging system vacuum
D. Oxygen supply pressure
D. Oxygen supply pressure When oxygen supply pressure falls, the
device reduces or shuts off the flow of other gases so the patient does
not receive a hypoxic mixture.
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, Anesthesia Technician (Certified)
3. What is the approximate pressure of medical gases delivered from
the hospital pipeline to the anesthesia machine?
A. 50 psi
B. 15 psi
C. 150 psi
D. 2000 psi
A. 50 psi Pipeline gases are supplied at roughly 50 psi, while full
oxygen cylinders sit near 2000 psi.
4. The first-stage regulator on an anesthesia machine cylinder yoke
reduces cylinder pressure to approximately what value?
A. 5 psi
B. 45 psi
C. 100 psi
D. 500 psi
B. 45 psi Cylinder pressure is stepped down to about 45 psi so it stays
just below pipeline pressure and the pipeline is used first.
5. The Pin Index Safety System is designed to prevent which of the
following errors?
A. Attaching the wrong gas cylinder to a yoke
B. Connecting the wrong hose to a wall outlet
C. Filling a vaporizer with the wrong agent
D. Reversing the inspiratory and expiratory valves
A. Attaching the wrong gas cylinder to a yoke Pin positions on the
yoke must match holes on the cylinder valve, so only the correct gas
cylinder can be seated.
6. The Diameter Index Safety System (DISS) applies to which
connections?
A. Vaporizer filling ports
B. Cylinder yoke connections
C. Non-interchangeable pipeline and hose connections
D. Breathing circuit 22 mm fittings
C. Non-interchangeable pipeline and hose connections DISS uses
gas-specific threaded fittings of differing diameters so hoses cannot be
attached to the wrong gas inlet.
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, Anesthesia Technician (Certified)
7. In the United States, which color is the standard code for an oxygen
cylinder?
A. Blue
B. Green
C. Yellow
D. Black
B. Green Oxygen is green, nitrous oxide is blue, medical air is yellow,
and nitrogen is black.
8. A full nitrous oxide cylinder stays at about 745 psi until nearly
empty. What explains this?
A. The gas is compressed to a fixed volume
B. A regulator inside the valve holds pressure steady
C. Nitrous oxide is stored as a solid
D. The contents are mostly liquid, so pressure reflects vapor pressure
D. The contents are mostly liquid, so pressure reflects vapor
pressure Because liquid N2O is vaporizing, pressure stays constant
until the liquid is gone, so the gauge does not show remaining volume.
9. When reading a flowmeter that uses a bobbin-type float, where
should the reading be taken?
A. At the bottom of the bobbin
B. At the widest point in the middle
C. At the tube's upper end cap
D. At the top of the bobbin
D. At the top of the bobbin A bobbin is read at the top edge, whereas
a ball float is read at its center.
10. Which valve delivers a high flow of pure oxygen directly to the
common gas outlet, bypassing the vaporizers?
A. Adjustable pressure-limiting valve
B. Check valve
C. Pressure relief valve
D. Oxygen flush valve
D. Oxygen flush valve The flush valve supplies about 35 to 75 L/min
of oxygen without passing through the vaporizer.
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, Anesthesia Technician (Certified)
Section 2: Machine Checkout and Leak Testing
11. A low-pressure system leak test is intended to detect leaks in which
part of the anesthesia machine?
A. Between the pipeline inlet and the regulators
B. Inside the ventilator bellows housing
C. Between the flowmeters and the common gas outlet
D. In the scavenging transfer tubing
C. Between the flowmeters and the common gas outlet The low-
pressure circuit lies downstream of the flowmeters, so it is tested to the
common gas outlet.
12. During a standard circuit pressure test, the circuit is pressurized to
what value with the Y-piece occluded and the APL valve closed?
A. 5 cm H2O
B. 30 cm H2O
C. 60 cm H2O
D. 100 cm H2O
B. 30 cm H2O The pressure should reach about 30 cm H2O and hold
steady for at least 10 seconds.
13. Which piece of backup equipment must be confirmed available
before every anesthetic?
A. A spare vaporizer
B. A second scavenging unit
C. A self-inflating resuscitation bag
D. An extra CO2 absorber canister
C. A self-inflating resuscitation bag A manual bag with a mask is
needed in case the machine or gas supply fails.
14. To calibrate an oxygen analyzer, the sensor is exposed to which
gas?
A. 100% oxygen only
B. Nitrous oxide at 50%
C. Room air at 21% oxygen
D. Nitrogen at 100%
C. Room air at 21% oxygen Room air is 21% oxygen, and a 100%
oxygen check is used as the second calibration point.
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