HVAC Test Questions with All Correct & 100% Verified
Answers| Actual Complete Exam| Already Graded A+
Two locations where a cold air return should be installed ✔Correct Answer-open area of a wall and
low to the ground
Which of the following is the law of thermodynamics? ✔Correct Answer-heat moves toward a
place with lower intensity
Sensible heat describes ✔Correct Answer-how hot something feels
Latent heat is measured in ✔Correct Answer-british thermal units
What is the amount of heat energy required to evaporate 1 pound of water? ✔Correct Answer-970
btu
In an air conditioning system and refrigeration system, what occurs in the evaporator? ✔Correct
Answer-the refrigerant absorbs the latent heat
In an air conditioning system and refrigeration system, what occurs in the condenser? ✔Correct
Answer-the refrigerant releases the latent heat
In a sealed system, pressure and temperature ✔Correct Answer-follow each other up and down
Which of the follow is not a type of compressor? lateral reciprocating rotary screw centrifugal
✔Correct Answer-lateral
In Fahrenheit, the boiling point of water is ✔Correct Answer-212 degrees
To change Fahrenheit to Celsius, which formula is used? ✔Correct Answer-C= (F-32) /1.8
Which is not a method by which heat may be transferred from a warmer substance to a colder
substance ✔Correct Answer-retraction
What btu of heat is required to raise 1 pound of ice 1 degree F when the temperature is below 32
degrees F? ✔Correct Answer-.5
What btu of heat is required to raise 1 pound of steam 1 degree F above the temperature of 212
degrees F? ✔Correct Answer-.5
A day-ton of refrigeration is the amount of refrigeration produced by melting 1 ton of ice at a
temperature of 32 degrees F in 24 hours ✔Correct Answer-true
Ice exerts pressure ✔Correct Answer-downwards
Pressure is usually measured in ✔Correct Answer-pounds per square inch
Atmospheric pressure, at sea level, is 14.7 psia ✔Correct Answer-true
, When one rises into the atmosphere, the atmospheric pressure decreases by 1 psi for every
✔Correct Answer-2,343 feet
Vaporization can be increased by ------- the pressure on a liquid ✔Correct Answer-reducing
Every mechanical refrigeration system has ---- different pressure levels ✔Correct Answer-2
Pressure on the high pressure side of a mechanical refrigeration unit is called ✔Correct Answer-
discharge or head pressure
The exertion of pressure on a substance with a constant temperature increases its volume in
proportion to the increase in pressure ✔Correct Answer-false
Heat causes a change in temperature of a substance is called ✔Correct Answer-sensible heat
What is heat, which causes a change in the state of a material without a change in temperature
called? ✔Correct Answer-latent heat
What is a sling psychrometer used to measure? ✔Correct Answer-wet and dry bulb temperature
A compressor is operation with a discharge pressure of 235.3 psig and a suction pressure of 35.3
psig. What is the compression ratio? ✔Correct Answer-5:1 . Compression ratio is found by dividing
the absolute discharge pressure by the absolute suction pressure. PSIG is converted to absolute by
adding 14.7 to the pressure
in this problem, discharge pressure 235.3 plus 14.7 equals 250 PSIA and the suction pressure 35.2
plus 14.7 equals 50 PSIA
250/50= ratio of 5:1
In a (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as
possible in order to: ✔Correct Answer-operate at high efficiency
An thermal expansion valve that is stuck wide open will cause ___________. ✔Correct Answer-a
flooded evaporator
What is the major difference between a heat pump and an air conditioner? ✔Correct Answer-
reversing valve- component that will reverse the flow of refrigerant when changing from air
conditioning to heating
What device controls the supplementary electric heat according to the outdoor temperature?
✔Correct Answer-outdoor ambient thermostat
What is not a factor that should be considered when installing an outdoor unit? ✔Correct Answer-
return air
What is the minimum clearance for access panels on an outdoor condensing unit? ✔Correct
Answer-30 inches
One BTU is the amount of heat required to raise the temperature of ✔Correct Answer-one pound
of water one-degree F
What is the primary composition of natural gas? ✔Correct Answer-95% methane
Answers| Actual Complete Exam| Already Graded A+
Two locations where a cold air return should be installed ✔Correct Answer-open area of a wall and
low to the ground
Which of the following is the law of thermodynamics? ✔Correct Answer-heat moves toward a
place with lower intensity
Sensible heat describes ✔Correct Answer-how hot something feels
Latent heat is measured in ✔Correct Answer-british thermal units
What is the amount of heat energy required to evaporate 1 pound of water? ✔Correct Answer-970
btu
In an air conditioning system and refrigeration system, what occurs in the evaporator? ✔Correct
Answer-the refrigerant absorbs the latent heat
In an air conditioning system and refrigeration system, what occurs in the condenser? ✔Correct
Answer-the refrigerant releases the latent heat
In a sealed system, pressure and temperature ✔Correct Answer-follow each other up and down
Which of the follow is not a type of compressor? lateral reciprocating rotary screw centrifugal
✔Correct Answer-lateral
In Fahrenheit, the boiling point of water is ✔Correct Answer-212 degrees
To change Fahrenheit to Celsius, which formula is used? ✔Correct Answer-C= (F-32) /1.8
Which is not a method by which heat may be transferred from a warmer substance to a colder
substance ✔Correct Answer-retraction
What btu of heat is required to raise 1 pound of ice 1 degree F when the temperature is below 32
degrees F? ✔Correct Answer-.5
What btu of heat is required to raise 1 pound of steam 1 degree F above the temperature of 212
degrees F? ✔Correct Answer-.5
A day-ton of refrigeration is the amount of refrigeration produced by melting 1 ton of ice at a
temperature of 32 degrees F in 24 hours ✔Correct Answer-true
Ice exerts pressure ✔Correct Answer-downwards
Pressure is usually measured in ✔Correct Answer-pounds per square inch
Atmospheric pressure, at sea level, is 14.7 psia ✔Correct Answer-true
, When one rises into the atmosphere, the atmospheric pressure decreases by 1 psi for every
✔Correct Answer-2,343 feet
Vaporization can be increased by ------- the pressure on a liquid ✔Correct Answer-reducing
Every mechanical refrigeration system has ---- different pressure levels ✔Correct Answer-2
Pressure on the high pressure side of a mechanical refrigeration unit is called ✔Correct Answer-
discharge or head pressure
The exertion of pressure on a substance with a constant temperature increases its volume in
proportion to the increase in pressure ✔Correct Answer-false
Heat causes a change in temperature of a substance is called ✔Correct Answer-sensible heat
What is heat, which causes a change in the state of a material without a change in temperature
called? ✔Correct Answer-latent heat
What is a sling psychrometer used to measure? ✔Correct Answer-wet and dry bulb temperature
A compressor is operation with a discharge pressure of 235.3 psig and a suction pressure of 35.3
psig. What is the compression ratio? ✔Correct Answer-5:1 . Compression ratio is found by dividing
the absolute discharge pressure by the absolute suction pressure. PSIG is converted to absolute by
adding 14.7 to the pressure
in this problem, discharge pressure 235.3 plus 14.7 equals 250 PSIA and the suction pressure 35.2
plus 14.7 equals 50 PSIA
250/50= ratio of 5:1
In a (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as
possible in order to: ✔Correct Answer-operate at high efficiency
An thermal expansion valve that is stuck wide open will cause ___________. ✔Correct Answer-a
flooded evaporator
What is the major difference between a heat pump and an air conditioner? ✔Correct Answer-
reversing valve- component that will reverse the flow of refrigerant when changing from air
conditioning to heating
What device controls the supplementary electric heat according to the outdoor temperature?
✔Correct Answer-outdoor ambient thermostat
What is not a factor that should be considered when installing an outdoor unit? ✔Correct Answer-
return air
What is the minimum clearance for access panels on an outdoor condensing unit? ✔Correct
Answer-30 inches
One BTU is the amount of heat required to raise the temperature of ✔Correct Answer-one pound
of water one-degree F
What is the primary composition of natural gas? ✔Correct Answer-95% methane
