BOMI: AHU, Water Treatment, and
Plumbing Exam 2026 Questions and
Answers 100% Pass Guaranteed
What is the relationship between thermal comfort and metabolic heat? - Correct
answer-Thermal comfort exists when the temperature and relative humidity of a
person's environment permit the person to lose, without conscious effort, metabolic
heat at the same rate he or she produces it. Because temperature and humidity
combine to make
humans feel comfortable in their surroundings, these characteristics must be
adjusted by the AC system in order to enhance human comfort.
What occupant activity level is chosen when engineers design an air-conditioning
system? - Correct answer-Office building air-conditioning systems are typically
designed to accommodate people engaged in sedentary activities, including tasks
done while seated or standing. Sedentary activity is the most important condition
because when people are sedentary, they think about their comfort or discomfort.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 1
,What is the rate of exchange of fresh air for return air based on in an AC system? -
Correct answer-The rate of exchange of fresh air for returned air is based on the
quantity of fresh air required for each building occupant over the course of time.
Define heat - Correct answer-Heat is energy that flows from one object to another.
Heat always travels from an object with more heat to an object with less heat until
both bodies are the same temperature.
What happens to the rate of heat transfer if the difference in temperature increases?
- Correct answer-The rate at which heat transfers increases as the difference in
temperature between the two objects increases.
What are the three methods of heat transfer? - Correct answer-Conduction,
Convection, and Radiation
Define conduction - Correct answer-Conduction is the direct transfer of heat from
one body to another. The substances have to be in physical contact with each other,
but there is no movement of the material itself.
Define latent heat - Correct answer-Latent heat is the energy that is used or
released during a change of state. Latent heat cannot be felt or measured with a
thermometer because it is hidden within a substance.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 2
,Define relative humidity - Correct answer-RH (relative humidity) describes the
amount of water vapor held in the air.
Does moist air have more or less density than dry air? - Correct answer-Moist air
has less mass than dry air and is less dense than dry air.
What is the atmospheric pressure of air at sea level? - Correct answer-At sea level,
atmospheric pressure exerts an average force of 14.7 pounds on each square inch
of surface (14.7 psi).
Explain Charles' Law. - Correct answer-Charles' law explains why gases expand
when heated and contract when cooled. Given a certain quantity of gas, as
temperature increases, volume increases. This is because the molecules have the
opportunity to move more and spread out. As pressure increases and the volume
decreases, the temperature will increase because compressing the gas causes the
molecules to
vibrate faster and collide into each other more frequently, causing friction heat.
Explain Boyle's Law. - Correct answer-Boyle's law states that at a constant
temperature, as the volume increases, the pressure decreases. If the pressure on a
certain amount of gas is doubled, the volume of space it requires will be cut in half.
As pressure goes up, volume goes down.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 3
, How does the human body regulate its temperature? - Correct answer-The body
dissipates heat by sending blood from internal organs to the skin where the heat is
thrown off into the
surroundings by radiant heat loss, convective heat loss, or evaporation. Perspiring
and losing the heat through
evaporation is an evaporative cooling process and is used in air-conditioning
systems as well as human bodies.
What system produces the most heat in a building? - Correct answer-Building
lights are the most significant internal heat source. The heat given off by lights
depends mainly on the wattage rating of the lighting elements. Lighting systems
produce heat loads of up to four watts per square foot. The heat gain from one watt
of electrical energy is equivalent to 3.4 Btu per hour.
How have office building AC systems been designed to compensate for heat gain
from office equipment? - Correct answer-To compensate for this heat gain from
office equipment in modern office buildings, air-conditioning systems have been
designed to offset one to three watts per square foot.
What is pull-down load? - Correct answer-Heat left over from the day before must
be removed the following morning when the air-conditioning system is restarted.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 4
Plumbing Exam 2026 Questions and
Answers 100% Pass Guaranteed
What is the relationship between thermal comfort and metabolic heat? - Correct
answer-Thermal comfort exists when the temperature and relative humidity of a
person's environment permit the person to lose, without conscious effort, metabolic
heat at the same rate he or she produces it. Because temperature and humidity
combine to make
humans feel comfortable in their surroundings, these characteristics must be
adjusted by the AC system in order to enhance human comfort.
What occupant activity level is chosen when engineers design an air-conditioning
system? - Correct answer-Office building air-conditioning systems are typically
designed to accommodate people engaged in sedentary activities, including tasks
done while seated or standing. Sedentary activity is the most important condition
because when people are sedentary, they think about their comfort or discomfort.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 1
,What is the rate of exchange of fresh air for return air based on in an AC system? -
Correct answer-The rate of exchange of fresh air for returned air is based on the
quantity of fresh air required for each building occupant over the course of time.
Define heat - Correct answer-Heat is energy that flows from one object to another.
Heat always travels from an object with more heat to an object with less heat until
both bodies are the same temperature.
What happens to the rate of heat transfer if the difference in temperature increases?
- Correct answer-The rate at which heat transfers increases as the difference in
temperature between the two objects increases.
What are the three methods of heat transfer? - Correct answer-Conduction,
Convection, and Radiation
Define conduction - Correct answer-Conduction is the direct transfer of heat from
one body to another. The substances have to be in physical contact with each other,
but there is no movement of the material itself.
Define latent heat - Correct answer-Latent heat is the energy that is used or
released during a change of state. Latent heat cannot be felt or measured with a
thermometer because it is hidden within a substance.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 2
,Define relative humidity - Correct answer-RH (relative humidity) describes the
amount of water vapor held in the air.
Does moist air have more or less density than dry air? - Correct answer-Moist air
has less mass than dry air and is less dense than dry air.
What is the atmospheric pressure of air at sea level? - Correct answer-At sea level,
atmospheric pressure exerts an average force of 14.7 pounds on each square inch
of surface (14.7 psi).
Explain Charles' Law. - Correct answer-Charles' law explains why gases expand
when heated and contract when cooled. Given a certain quantity of gas, as
temperature increases, volume increases. This is because the molecules have the
opportunity to move more and spread out. As pressure increases and the volume
decreases, the temperature will increase because compressing the gas causes the
molecules to
vibrate faster and collide into each other more frequently, causing friction heat.
Explain Boyle's Law. - Correct answer-Boyle's law states that at a constant
temperature, as the volume increases, the pressure decreases. If the pressure on a
certain amount of gas is doubled, the volume of space it requires will be cut in half.
As pressure goes up, volume goes down.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 3
, How does the human body regulate its temperature? - Correct answer-The body
dissipates heat by sending blood from internal organs to the skin where the heat is
thrown off into the
surroundings by radiant heat loss, convective heat loss, or evaporation. Perspiring
and losing the heat through
evaporation is an evaporative cooling process and is used in air-conditioning
systems as well as human bodies.
What system produces the most heat in a building? - Correct answer-Building
lights are the most significant internal heat source. The heat given off by lights
depends mainly on the wattage rating of the lighting elements. Lighting systems
produce heat loads of up to four watts per square foot. The heat gain from one watt
of electrical energy is equivalent to 3.4 Btu per hour.
How have office building AC systems been designed to compensate for heat gain
from office equipment? - Correct answer-To compensate for this heat gain from
office equipment in modern office buildings, air-conditioning systems have been
designed to offset one to three watts per square foot.
What is pull-down load? - Correct answer-Heat left over from the day before must
be removed the following morning when the air-conditioning system is restarted.
©COPYRIGHT 2025, ALL RIGHTS RESERVE 4
