HVAC Final Exam Newest 2026 Questions and
Correct Detailed Answers Already Graded A+
When the refrigerant evaporates, it absorbs heat when it changes from a
liquid to a gas. In which unit does this occur? - CORRECT ANSWER-
Evaporator
Which unit contains a desiccant to remove moisture from the system? -
CORRECT ANSWER-Receiver-drier and accumulator.
The low side of the refrigeration cycle means: - CORRECT ANSWER-It has
low temperature and pressure.
Pressures are controlled in an orifice tube (OT) system by: - CORRECT
ANSWER-Cycling an electromagnetic compressor clutch on and off as
needed or using a variable displacement compressor.
What type of compressors are used in air conditioning systems? -
CORRECT ANSWER-Piston compressors, vane compressors, and scroll
compressors.
In a piston-type compressor, the pistons are driven by a: - CORRECT
ANSWER-Crankshaft, swash plate, or a wobble plate.
,What refrigerant is kept in white containters with a red stripe? - CORRECT
ANSWER-R-1234yf
What refrigerant is kept in light blue containers? - CORRECT ANSWER-R-
134a
Most piston compressors use what type of valves? - CORRECT ANSWER-
reed
A compressor speed (belt lock) sensor is used by the HVAC ECM to: -
CORRECT ANSWER-Prevent a locked-up compressor from destroying the
engine drive belt and determine if the compressor is running by comparing
the compressor and engine speed signals.
The three different phases or states of matter include __________ -
CORRECT ANSWER-Solid, liquid, and gas
An air conditioning system cools the interior of the vehicle by __________ -
CORRECT ANSWER-Moving the heat from inside the vehicle to outside the
vehicle
Twenty degrees celsius is about how many degrees Fahrenheit? -
CORRECT ANSWER-65
Heat intensity is measured in __________ - CORRECT ANSWER-BTUs
, A psychrometer measures ___________ - CORRECT ANSWER-relative
humidity
A BTU is a measure of __________ - CORRECT ANSWER-amount of heat
Heat transferred through the air is called __________ - CORRECT
ANSWER-Radiation
Air conditioning process works through a fluid, called a/an __________ that
continuously changes state from liquid to gas and back to liquid. -
CORRECT ANSWER-Refrigerant
Humans prefer temperatures that are between ____ and ____ - CORRECT
ANSWER-68F to 78F
Humans prefer relative humidity that is between ____ and _____. -
CORRECT ANSWER-45% to 55%
What is the difference between a pressure switch and a pressure sensor? -
CORRECT ANSWER-A pressure switch is either on or off, whereas a
pressure sensor is variable and supplies pressure information to the
PCM/BCM.
Heat travels from: - CORRECT ANSWER-Hot to cooler
Correct Detailed Answers Already Graded A+
When the refrigerant evaporates, it absorbs heat when it changes from a
liquid to a gas. In which unit does this occur? - CORRECT ANSWER-
Evaporator
Which unit contains a desiccant to remove moisture from the system? -
CORRECT ANSWER-Receiver-drier and accumulator.
The low side of the refrigeration cycle means: - CORRECT ANSWER-It has
low temperature and pressure.
Pressures are controlled in an orifice tube (OT) system by: - CORRECT
ANSWER-Cycling an electromagnetic compressor clutch on and off as
needed or using a variable displacement compressor.
What type of compressors are used in air conditioning systems? -
CORRECT ANSWER-Piston compressors, vane compressors, and scroll
compressors.
In a piston-type compressor, the pistons are driven by a: - CORRECT
ANSWER-Crankshaft, swash plate, or a wobble plate.
,What refrigerant is kept in white containters with a red stripe? - CORRECT
ANSWER-R-1234yf
What refrigerant is kept in light blue containers? - CORRECT ANSWER-R-
134a
Most piston compressors use what type of valves? - CORRECT ANSWER-
reed
A compressor speed (belt lock) sensor is used by the HVAC ECM to: -
CORRECT ANSWER-Prevent a locked-up compressor from destroying the
engine drive belt and determine if the compressor is running by comparing
the compressor and engine speed signals.
The three different phases or states of matter include __________ -
CORRECT ANSWER-Solid, liquid, and gas
An air conditioning system cools the interior of the vehicle by __________ -
CORRECT ANSWER-Moving the heat from inside the vehicle to outside the
vehicle
Twenty degrees celsius is about how many degrees Fahrenheit? -
CORRECT ANSWER-65
Heat intensity is measured in __________ - CORRECT ANSWER-BTUs
, A psychrometer measures ___________ - CORRECT ANSWER-relative
humidity
A BTU is a measure of __________ - CORRECT ANSWER-amount of heat
Heat transferred through the air is called __________ - CORRECT
ANSWER-Radiation
Air conditioning process works through a fluid, called a/an __________ that
continuously changes state from liquid to gas and back to liquid. -
CORRECT ANSWER-Refrigerant
Humans prefer temperatures that are between ____ and ____ - CORRECT
ANSWER-68F to 78F
Humans prefer relative humidity that is between ____ and _____. -
CORRECT ANSWER-45% to 55%
What is the difference between a pressure switch and a pressure sensor? -
CORRECT ANSWER-A pressure switch is either on or off, whereas a
pressure sensor is variable and supplies pressure information to the
PCM/BCM.
Heat travels from: - CORRECT ANSWER-Hot to cooler
