ANESTHESIA MACHINE AND EQUIPMENT
MOCK TEST WITH ANSWER RATIONALES 2026
◉ components of the high pressure system
Answer: Hanger Yoke, check valve, cylinder pressure gauge, and First
stage pressure regulator
◉ What is the hanger yoke?
Answer: orients and supports the gas tank/cylinder, providing a gas
tight seal and ensures a unidirectional gas flow.. Contains a nipple
thru which the gas flows...
it contains a Pin Index Safety System (PISS) which prevents incorrect
cylinder attachment
◉ What is the function of the check valve in the high pressure
system?
Answer: allows gas from a cylinder to enter the machine but
prevents gas from exiting the machine
when there is no cylinder in the yoke...
Also will not allow gas to flow between full and empty cylinders or
between cylinders of different pressures
◉ What is the purpose of the first stage pressure regulator?
, Answer: It reduces the high pressure from the cylinder (~1900-
2200 psi) to about 45 psi
◉ What is pipeline pressure?
Answer: pressure coming from the hospital (pipeline)... it is usually
about 50-55 psi
◉ Why is pressure at the first stage regulator outlets set lower than
pipeline pressure?
Answer: It ensures that pipeline gas is used preferentially to the
cylinder supply if the cylinder is open... Also if there is a loss of
pipeline pressure, the machine will draw from the open cylinder, but
when pipeline pressure is back the machine will again draw from
the pipeline gases since the pipeline pressure is higher than the
cylinder (55 compared to 45)
◉ What is the intermediate pressure system of the anesthesia
machine?
Answer: It receives gases from the pressure regulator or the pipeline
inlet.. (this is usually inside the machine)
◉ Components of the intermediate pressure system?
Answer: 1. Pneumatic component of master switch
2. pipeline inlet connection
MOCK TEST WITH ANSWER RATIONALES 2026
◉ components of the high pressure system
Answer: Hanger Yoke, check valve, cylinder pressure gauge, and First
stage pressure regulator
◉ What is the hanger yoke?
Answer: orients and supports the gas tank/cylinder, providing a gas
tight seal and ensures a unidirectional gas flow.. Contains a nipple
thru which the gas flows...
it contains a Pin Index Safety System (PISS) which prevents incorrect
cylinder attachment
◉ What is the function of the check valve in the high pressure
system?
Answer: allows gas from a cylinder to enter the machine but
prevents gas from exiting the machine
when there is no cylinder in the yoke...
Also will not allow gas to flow between full and empty cylinders or
between cylinders of different pressures
◉ What is the purpose of the first stage pressure regulator?
, Answer: It reduces the high pressure from the cylinder (~1900-
2200 psi) to about 45 psi
◉ What is pipeline pressure?
Answer: pressure coming from the hospital (pipeline)... it is usually
about 50-55 psi
◉ Why is pressure at the first stage regulator outlets set lower than
pipeline pressure?
Answer: It ensures that pipeline gas is used preferentially to the
cylinder supply if the cylinder is open... Also if there is a loss of
pipeline pressure, the machine will draw from the open cylinder, but
when pipeline pressure is back the machine will again draw from
the pipeline gases since the pipeline pressure is higher than the
cylinder (55 compared to 45)
◉ What is the intermediate pressure system of the anesthesia
machine?
Answer: It receives gases from the pressure regulator or the pipeline
inlet.. (this is usually inside the machine)
◉ Components of the intermediate pressure system?
Answer: 1. Pneumatic component of master switch
2. pipeline inlet connection
