HBO CHT EXAM 2025 QUESTIONS AND ANSWERS
Pressure is defined as? - (answer)The force per unit area acting on a surface in a direction perpendicular
to that surface
Force is defined as? - (answer)An External cause responsible for any change of physical system.
Acceleration is defined as? - (answer)The rate of change (or time derivative) of velocity.
Gas is defined as? - (answer)A phase of matter
Solid is defined as? - (answer)A liquid that is at its freezing point.
Plasma is defined as? - (answer)Atoms or molecules that have become ionized.
Liquid is defined as? - (answer)A solid that is at its melting point
In the gas phase, the atoms or molecules basically move? - (answer)Randomly
Liquids change to a gas at? - (answer)Their respective boiling points! Think about water turning to steam
when it boils
When applying pressure to a fluid, the pressure is exerted? - (answer)In all directions equally. (pascal's
law)
Hydraulics is a branch of science and engineering concerned with the mechanical properties of? -
(answer)Liquids! Pneumatic refers to gas fyi
A mechanical gauge is used when measuring gas pressure in a sealed container. For all common
pressure gauges, the pressure indicated on the gauge is? - (answer)Less than the absolute pressure
(Gauges (and gauge pressures) ignore the ambient (barometric) pressure around us.
,HBO CHT EXAM 2025 QUESTIONS AND ANSWERS
Absolute pressure can be defined as? - (answer)The amount of pressure within the sealed vessel + the
amount of pressure outside the sealed vessel.
Gauge pressure? - (answer)The amount of pressure within the sealed vessel only
Ambient pressure? - (answer)The amount of pressure outside of the sealed vessel only.
Absolute pressure can be defined as? - (answer)Gauge pressure + atmospheric pressure, Total pressure,
True pressure
1 Atm worth of pressure? - (answer)760 mmHg, 14.7 PSI, 33 FSW
Barometric pressure in Denver, CO (elevation 5000 ft) is less than barometric pressure at sea level true
or false? - (answer)True
To Convert from ATA to mmHg - (answer)Multiply by 760
To Convert from ATA to FSW - (answer)Subtract 1, then multiply by 33
To convert from ATA to PSI - (answer)Subtract 1, then multiply by 14.7
To convert from FSW to ATA - (answer)Divide by 33, then add 1
To convert from FSW to ATA - (answer)Add 33, then divide by 33
To convert from PSI to ATA - (answer)Divide by 14.7, then add 1
, HBO CHT EXAM 2025 QUESTIONS AND ANSWERS
To convert from PSI to ATA - (answer)Add 14.7, then divide by 14.7
To convert from mmHg to ATA - (answer)Divide by 760
To convert from PSIG to PSIA - (answer)Add 14.7, PSIG means "pound per square inch gauge". PSIA
means pounds per square ince absolute.
Boyle's law is about the? - (answer)Pressure-volume relationship. Boyle's law says that with temperature
constant, the volume of a gas is inversely proportional to the pressure.
According to Boyle's Law, (assuming the temperature remains constant) when the pressure increases,
the volume? - (answer)Decreases proportionally
When applying Boyle's law to the human body, we worry about air-filled spaces being shrunk ( or
squeezed) when pressure around the body increases. This is known as? - (answer)Barotrauma
Boyle's law equation? - (answer)P1 x V1=P2 xV2
Charles law is about the? - (answer)Temperature-volume relationship, With pressure constant, the
volume of a gas is directly proportional to the temperature.
According to Charles' law, the volume in a flexible container, like a balloon, will _____ when the
temperature increases. - (answer)Increase proportionally.
According to Charles' law, the volume in a flexible container, like a balloon, will _____ when the volume
increases. - (answer)Increase proportionally.
Gay-Lussac's law is about the? - (answer)Temperature-pressure relationship, Law says that with volume
constant, the temperature of a gas is directly proportional to the pressure
Pressure is defined as? - (answer)The force per unit area acting on a surface in a direction perpendicular
to that surface
Force is defined as? - (answer)An External cause responsible for any change of physical system.
Acceleration is defined as? - (answer)The rate of change (or time derivative) of velocity.
Gas is defined as? - (answer)A phase of matter
Solid is defined as? - (answer)A liquid that is at its freezing point.
Plasma is defined as? - (answer)Atoms or molecules that have become ionized.
Liquid is defined as? - (answer)A solid that is at its melting point
In the gas phase, the atoms or molecules basically move? - (answer)Randomly
Liquids change to a gas at? - (answer)Their respective boiling points! Think about water turning to steam
when it boils
When applying pressure to a fluid, the pressure is exerted? - (answer)In all directions equally. (pascal's
law)
Hydraulics is a branch of science and engineering concerned with the mechanical properties of? -
(answer)Liquids! Pneumatic refers to gas fyi
A mechanical gauge is used when measuring gas pressure in a sealed container. For all common
pressure gauges, the pressure indicated on the gauge is? - (answer)Less than the absolute pressure
(Gauges (and gauge pressures) ignore the ambient (barometric) pressure around us.
,HBO CHT EXAM 2025 QUESTIONS AND ANSWERS
Absolute pressure can be defined as? - (answer)The amount of pressure within the sealed vessel + the
amount of pressure outside the sealed vessel.
Gauge pressure? - (answer)The amount of pressure within the sealed vessel only
Ambient pressure? - (answer)The amount of pressure outside of the sealed vessel only.
Absolute pressure can be defined as? - (answer)Gauge pressure + atmospheric pressure, Total pressure,
True pressure
1 Atm worth of pressure? - (answer)760 mmHg, 14.7 PSI, 33 FSW
Barometric pressure in Denver, CO (elevation 5000 ft) is less than barometric pressure at sea level true
or false? - (answer)True
To Convert from ATA to mmHg - (answer)Multiply by 760
To Convert from ATA to FSW - (answer)Subtract 1, then multiply by 33
To convert from ATA to PSI - (answer)Subtract 1, then multiply by 14.7
To convert from FSW to ATA - (answer)Divide by 33, then add 1
To convert from FSW to ATA - (answer)Add 33, then divide by 33
To convert from PSI to ATA - (answer)Divide by 14.7, then add 1
, HBO CHT EXAM 2025 QUESTIONS AND ANSWERS
To convert from PSI to ATA - (answer)Add 14.7, then divide by 14.7
To convert from mmHg to ATA - (answer)Divide by 760
To convert from PSIG to PSIA - (answer)Add 14.7, PSIG means "pound per square inch gauge". PSIA
means pounds per square ince absolute.
Boyle's law is about the? - (answer)Pressure-volume relationship. Boyle's law says that with temperature
constant, the volume of a gas is inversely proportional to the pressure.
According to Boyle's Law, (assuming the temperature remains constant) when the pressure increases,
the volume? - (answer)Decreases proportionally
When applying Boyle's law to the human body, we worry about air-filled spaces being shrunk ( or
squeezed) when pressure around the body increases. This is known as? - (answer)Barotrauma
Boyle's law equation? - (answer)P1 x V1=P2 xV2
Charles law is about the? - (answer)Temperature-volume relationship, With pressure constant, the
volume of a gas is directly proportional to the temperature.
According to Charles' law, the volume in a flexible container, like a balloon, will _____ when the
temperature increases. - (answer)Increase proportionally.
According to Charles' law, the volume in a flexible container, like a balloon, will _____ when the volume
increases. - (answer)Increase proportionally.
Gay-Lussac's law is about the? - (answer)Temperature-pressure relationship, Law says that with volume
constant, the temperature of a gas is directly proportional to the pressure
