RI JOURNEYMAN'S REFRIGERATION LICENSE EXAM
QUESTIONS AND 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________________ -
ANSWER-latent heat of condensation.
When a substance changes from a solid to a gas, this is known as the________________ -
ANSWER-the latent heat of sublimation
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 Baudelot 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.
____________________________ Is called the ambient temperature. - ANSWER-The
temperature of the air that surrounds any object
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
QUESTIONS AND 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________________ -
ANSWER-latent heat of condensation.
When a substance changes from a solid to a gas, this is known as the________________ -
ANSWER-the latent heat of sublimation
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 Baudelot 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.
____________________________ Is called the ambient temperature. - ANSWER-The
temperature of the air that surrounds any object
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
