RI Journeyman's Refrigeration License
Study Guide Exam And Actual Answers.
The temperature scale that freezes water at 32 deg. and boils water at 212 deg. is known as the
___________ scale - Answer Fahrenheit
The temperature scale that freezes water at 0 deg. and boils water at 100 deg. is known as the
__________ scale. - Answer Centigrade
The definition of specific heat is _______________________ - Answer the amount of heat
required to raise 1 lb of a substance 1 deg. F.
The definition of sensible heat is ______ - Answer the heat that can be measured by a
thermometer.
The definition of latent heat is ______ - Answer the heat used which causes a change of state
The definition of a BTU is ________ - Answer the amount of heat required to raise 1 lb of
water 1 deg. F
Heat energy is measured in _________ - Answer BTU
Three states of matter are _________ - Answer Solid, Liquid, and Gas
One ton of refrigeration is equal to __________ - Answer 12,000 btu per hour
____________ is the type of heat that is absorbed or extracted from a substance when the
substance changes state - Answer Latent Heat
When a substance changes from a liquid to a gas, this is known as the________________ -
Answer latent heat of vaporization
When a substance changes from a gas to a liquid, this is known as the________________ -
,In a refrigeration system, heat is absorbed by ______________ - Answer the latent heat of
vaporization in the evaporator.
In a refrigeration system, heat is rejected by _________ - Answer the latent heat of
condensation in the condenser.
Frost is - Answer adsorbed by the evaporator
The relationship of absolute pressure on the low side to the absolute pressure on the high side
is called the ___________ - Answer compression ratio
________________________________ Is called the refrigerating effect - Answer The amount
of heat absorbed by the refrigerant used
Generally speaking the ____________________ is the type of system that gives the greatest
rate of heat transfer - Answer flooded evaporator
________________ the total amount of heat present in a given substance. - Answer Enthalpy
is
When hot air remains at the top of a room and cold air at the bottom you will have an
occurrence of a condition known as ___________ - Answer stratified air.
The ____ State of a substance will have the highest heat content. - Answer vapor
One cubic foot of air at 50 deg F can absorb _____________ - Answer less moisture than it
could at 100 deg. F.
A Boudelot cooler ________________ - Answer is a heat exchanger
When placed in a bucket of water, the refrigeration effect of 32 deg F. Ice will always be
______________ - Answer 144 btu per pound.
, The highest temperature at which vapor can be liquified regardless of the pressure applied is
called ___________________ - Answer the critical temperature of a substance.
The critical pressure of a substance is the pressure at which ____________ - Answer a liquid
cannot become a vapor by adding heat.
The boiling point of water ______________ when salt is added - Answer increases
Heat travels in accordance with the __________________ - Answer second law of
thermodynamics.
One degree day is __________________________ - Answer computed by taking the average
of the highest and lowest temperatures recorded for a given day and subtracting it from 65 deg.
F
The term "Volumetric Efficiency" is the ___________________ - Answer actual volume of
vapor pumped divided by the calculated volume.
Refrigerant having either Chorine or Fluorine __________________ when in contact with flame.
- Answer can break down to phosgene
Absolute pressure is _____________ - Answer Gauge pressure plus 15
___________ must not be used in any refrigeration system that contains halogenated
refrigerant. - Answer Magnesium
Pressure vessels having a maximum design pressure of 15 psig must be strong enough to
________________ - Answer withstand at least 3 times the design pressure and be tested to 1
1/3 times pressure for which they are rated.
The minimum design pressure for a refrigeration system can not be less than ____________ -
Answer 15 psig
A systems design pressure must not be less than the saturation pressure of the refrigerant at
____________ - Answer 80 deg. F. on the low side and 125 deg. F. on the high side for an air
Study Guide Exam And Actual Answers.
The temperature scale that freezes water at 32 deg. and boils water at 212 deg. is known as the
___________ scale - Answer Fahrenheit
The temperature scale that freezes water at 0 deg. and boils water at 100 deg. is known as the
__________ scale. - Answer Centigrade
The definition of specific heat is _______________________ - Answer the amount of heat
required to raise 1 lb of a substance 1 deg. F.
The definition of sensible heat is ______ - Answer the heat that can be measured by a
thermometer.
The definition of latent heat is ______ - Answer the heat used which causes a change of state
The definition of a BTU is ________ - Answer the amount of heat required to raise 1 lb of
water 1 deg. F
Heat energy is measured in _________ - Answer BTU
Three states of matter are _________ - Answer Solid, Liquid, and Gas
One ton of refrigeration is equal to __________ - Answer 12,000 btu per hour
____________ is the type of heat that is absorbed or extracted from a substance when the
substance changes state - Answer Latent Heat
When a substance changes from a liquid to a gas, this is known as the________________ -
Answer latent heat of vaporization
When a substance changes from a gas to a liquid, this is known as the________________ -
,In a refrigeration system, heat is absorbed by ______________ - Answer the latent heat of
vaporization in the evaporator.
In a refrigeration system, heat is rejected by _________ - Answer the latent heat of
condensation in the condenser.
Frost is - Answer adsorbed by the evaporator
The relationship of absolute pressure on the low side to the absolute pressure on the high side
is called the ___________ - Answer compression ratio
________________________________ Is called the refrigerating effect - Answer The amount
of heat absorbed by the refrigerant used
Generally speaking the ____________________ is the type of system that gives the greatest
rate of heat transfer - Answer flooded evaporator
________________ the total amount of heat present in a given substance. - Answer Enthalpy
is
When hot air remains at the top of a room and cold air at the bottom you will have an
occurrence of a condition known as ___________ - Answer stratified air.
The ____ State of a substance will have the highest heat content. - Answer vapor
One cubic foot of air at 50 deg F can absorb _____________ - Answer less moisture than it
could at 100 deg. F.
A Boudelot cooler ________________ - Answer is a heat exchanger
When placed in a bucket of water, the refrigeration effect of 32 deg F. Ice will always be
______________ - Answer 144 btu per pound.
, The highest temperature at which vapor can be liquified regardless of the pressure applied is
called ___________________ - Answer the critical temperature of a substance.
The critical pressure of a substance is the pressure at which ____________ - Answer a liquid
cannot become a vapor by adding heat.
The boiling point of water ______________ when salt is added - Answer increases
Heat travels in accordance with the __________________ - Answer second law of
thermodynamics.
One degree day is __________________________ - Answer computed by taking the average
of the highest and lowest temperatures recorded for a given day and subtracting it from 65 deg.
F
The term "Volumetric Efficiency" is the ___________________ - Answer actual volume of
vapor pumped divided by the calculated volume.
Refrigerant having either Chorine or Fluorine __________________ when in contact with flame.
- Answer can break down to phosgene
Absolute pressure is _____________ - Answer Gauge pressure plus 15
___________ must not be used in any refrigeration system that contains halogenated
refrigerant. - Answer Magnesium
Pressure vessels having a maximum design pressure of 15 psig must be strong enough to
________________ - Answer withstand at least 3 times the design pressure and be tested to 1
1/3 times pressure for which they are rated.
The minimum design pressure for a refrigeration system can not be less than ____________ -
Answer 15 psig
A systems design pressure must not be less than the saturation pressure of the refrigerant at
____________ - Answer 80 deg. F. on the low side and 125 deg. F. on the high side for an air
