A-C - HVAC TCAT STUDY GUIDE WITH
COMPLETE SOLUTION
Sensible heat is the heat which causes a change in temperature of a
substance -
latent heat is the heat which causes a change in state of a material w/o a
change in temperature -
super heat is the heat which is added to a vapor after the change of state
occurs -
the methods by which heat can travel
A) conduction
B) convection
C)radiation
D)all of the above - ANSWER D)all of the above
the transfer of heat by means of fluid (or air) is known as
A) conduction
B) convection
C)radiation
D)all of the above - ANSWER B)convection
,the transfer of heat by direct contact is known as
A) conduction
B) convection
C)radiation
D)all of the above - ANSWER A)conduction
the standard measure of the amount of heat in a substance is - ANSWER the
British Thermal Unit BTU
a refrigerant releases heat when - ANSWER it condenses
it is desirable for refrigerant in the suction line to be slightly superheated in
order to - ANSWER insure liquid refrigerant does not enter the compressor
the state of the refrigerant in the suction line should be - ANSWER low
pressure/low temperature vapor
the state of the refrigerant entering the condenser is - ANSWER high
pressure/highly superheated vapor
, the evaporator - ANSWER Transfers heat from the refrigerated space to the
refrigerant
which of the following is NOT a thermodynamic property of refrigerants -
ANSWER flammability
the sequential order of steps in the vapor- compression process are -
ANSWER compression, condensation, expansion, vaporization
if a 30 pound cylinder of reclaimed R-12 refrigerant has been stored over
night at 70 Degrees Fahrenheit, the pressure in the cylinder should be
approximately - ANSWER 70.2
pressure lower than atmospheric are measured in
A)inches of mercury ("hg")
B)microns
C)psig
D)either "A" or "B" - ANSWER D)either "A" or "B"
zero psia (pounds per square inch absolute) is
A)the same as atmospheric pressure
COMPLETE SOLUTION
Sensible heat is the heat which causes a change in temperature of a
substance -
latent heat is the heat which causes a change in state of a material w/o a
change in temperature -
super heat is the heat which is added to a vapor after the change of state
occurs -
the methods by which heat can travel
A) conduction
B) convection
C)radiation
D)all of the above - ANSWER D)all of the above
the transfer of heat by means of fluid (or air) is known as
A) conduction
B) convection
C)radiation
D)all of the above - ANSWER B)convection
,the transfer of heat by direct contact is known as
A) conduction
B) convection
C)radiation
D)all of the above - ANSWER A)conduction
the standard measure of the amount of heat in a substance is - ANSWER the
British Thermal Unit BTU
a refrigerant releases heat when - ANSWER it condenses
it is desirable for refrigerant in the suction line to be slightly superheated in
order to - ANSWER insure liquid refrigerant does not enter the compressor
the state of the refrigerant in the suction line should be - ANSWER low
pressure/low temperature vapor
the state of the refrigerant entering the condenser is - ANSWER high
pressure/highly superheated vapor
, the evaporator - ANSWER Transfers heat from the refrigerated space to the
refrigerant
which of the following is NOT a thermodynamic property of refrigerants -
ANSWER flammability
the sequential order of steps in the vapor- compression process are -
ANSWER compression, condensation, expansion, vaporization
if a 30 pound cylinder of reclaimed R-12 refrigerant has been stored over
night at 70 Degrees Fahrenheit, the pressure in the cylinder should be
approximately - ANSWER 70.2
pressure lower than atmospheric are measured in
A)inches of mercury ("hg")
B)microns
C)psig
D)either "A" or "B" - ANSWER D)either "A" or "B"
zero psia (pounds per square inch absolute) is
A)the same as atmospheric pressure
