HVAC EXAM QUESTIONS AND ANSWERS 100% SOLVED
GRADED A+ LATEST UPDATE 2024
Heat Transfer
Moves from one substance to another as well as between molecules of a substance,
temperature is the driving force
Temperature
The level of heat or heat intensity, measured with thermometers
Heat
Is the motion of molecules, and travels from a warm substance to a cold substance
Conduction
Energy travelling from one molecule to another, involves direct contact
Radiation
Passes through air and heats the first solid object it comes in contact with
Sensible Heat
Heat transfer that results in the change of temperature of a substance
Convection
Used to move heat from one location to another, and is energy travelling through a fluid
from one substance to another
Latent Heat
Results in the change in state of a substance, its energy is stored when a liquid turns to
gas, and released when a gas turns to a liquid.
Specific Heat
, The amount of heat necessary to raise the temperature of 1lb of a substance 1 degree
F.
Matter
A substance that occupies space and has mass, and is made up of atoms
Mass
Is the property of matter that responds to gravitational attraction.
Density
Describes a substance's mass to volume relationship
Specific Gravity
Is a unitless number because it is the density of a substance divided by the density of
water. Water is used as a comparison. The density of water is 62.4 lb/ft^3 which equals
1, anything greater than 1 will sink anything less will sink.
Specific Volume
Indicates the volume that each pound of a gas occupies,when air is heated it volume
increases and whens its cooled its volume decreases, one pound of clean dry air has a
total volume of 13.33 ft^3.
Law of conservation of energy
States that energy is neither created or destroyed but can be converted from one form
to another.
One ton of refrigeration
Is the amount of heat required to melt 1 ton of ice in a 24 hour period
Temperature/Pressure Relationship
GRADED A+ LATEST UPDATE 2024
Heat Transfer
Moves from one substance to another as well as between molecules of a substance,
temperature is the driving force
Temperature
The level of heat or heat intensity, measured with thermometers
Heat
Is the motion of molecules, and travels from a warm substance to a cold substance
Conduction
Energy travelling from one molecule to another, involves direct contact
Radiation
Passes through air and heats the first solid object it comes in contact with
Sensible Heat
Heat transfer that results in the change of temperature of a substance
Convection
Used to move heat from one location to another, and is energy travelling through a fluid
from one substance to another
Latent Heat
Results in the change in state of a substance, its energy is stored when a liquid turns to
gas, and released when a gas turns to a liquid.
Specific Heat
, The amount of heat necessary to raise the temperature of 1lb of a substance 1 degree
F.
Matter
A substance that occupies space and has mass, and is made up of atoms
Mass
Is the property of matter that responds to gravitational attraction.
Density
Describes a substance's mass to volume relationship
Specific Gravity
Is a unitless number because it is the density of a substance divided by the density of
water. Water is used as a comparison. The density of water is 62.4 lb/ft^3 which equals
1, anything greater than 1 will sink anything less will sink.
Specific Volume
Indicates the volume that each pound of a gas occupies,when air is heated it volume
increases and whens its cooled its volume decreases, one pound of clean dry air has a
total volume of 13.33 ft^3.
Law of conservation of energy
States that energy is neither created or destroyed but can be converted from one form
to another.
One ton of refrigeration
Is the amount of heat required to melt 1 ton of ice in a 24 hour period
Temperature/Pressure Relationship
