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Test Bank For Modern Refrigeration and Air Conditioning 21st Edition by Andrew 2
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Test Bank For Modern Refrigeration and AirConditioning 21st Edition by Andrew D. Althouse, Carl
H. Turnquist, Alfred F. Bracciano, Daniel C. Bracciano,
Gloria M. Bracciano
A substance's mass per unit of volume is it's___________. - ANSWER Density
(Modern Refrigeration PG 54)
The heat required to raise the temperature of one pound a substance by a one
degree Fahrenheit is known as what? - ANSWER Specific heat (Modern
Refrigeration PG 59)
What is a British thermal unit (BTU or Btu) defined as? - ANSWER The amount of
heat required to raise the temperature of one pound of water by one degree
Fahrenheit
(Modern Refrigeration PG 60)
_________, as it is used in refrigeration, is the total amount of heat in a substance,
calculated from an accepted reference. - ANSWER Enthalpy (Modern Refrigeration
PG 62)
__________ is the flow of heat through a material due to molecular vibrations in the
material. - ANSWER Conduction (Modern Refrigeration PG 63)
_________ is the transfer of heat by heat rays - ANSWER Radiation (Modern
Refrigeration PG 63)
___________ is the movement of heat from one place to another by way of a liquid
or gas. - ANSWER Convection (Modern Refrigeration PG 63)
Heat that brings about a change of state with no change in temperature is called
what? - ANSWER Latent Heat (Modern Refrigeration PG 64)
__________ is heat that changes the temperature of a substance - ANSWER
Sensible (Modern Refrigeration PG 65)
What is the latent heat of vaporization for water? - ANSWER 970 Btu/lb (Modern
Refrigeration PG 65)
What is one ton of refrigerant equivalent to? - ANSWER Is equal to 12,000 Btu per
hour
Is equal to 200 Btu per minute
Is equal to 288,000 Btu per 24 hours
,Represents the amount of heat energy absorbed when one ton (2000 lb) of ice melts
during one 24 hour day.
(Modern Refrigeration PG 66)
When referring to a system's capacity, most technicians define a ton of refrigeration
as ________. - ANSWER 12,000 BTUh (Modern Refrigeration PG 66)
A ton of refrigeration represents the amount of heat energy absorbed when one ton
(2000 lb) of ice melts __________. - ANSWER During one 24 hour day (Modern
Refrigeration PG 66)
What is the latent heat of fusion for ice? - ANSWER (Modern Refrigeration PG 66)
Which law states that when pressure is raised in a confined fluid, there is an equal
increase at every other point in the container? - ANSWER Pascal's law (Modern
Refrigeration PG 72)
The __________ of a substance is the temperature at and above which vapor of the
substance cannot be liquefied, no matter how much pressure is applied to it. -
ANSWER Critical temperature (Modern Refrigeration PG 73)
Water boils _________ as the pressure increases. - ANSWER Slower (Modern
Refrigeration PG 73)
What affects the temperature a refrigerant will vaporize? - ANSWER Pressure
(Modern Refrigeration PG 73)
What affects the temperature that a refrigerant will vaporize? - ANSWER Pressure
(Modern Refrigeration PG 73)
What does PSIA mean? - ANSWER Absolute pressure (Modern Refrigeration PG
75)
What tool is used to measure atmospheric pressure? - ANSWER Barometer
(Modern Refrigeration PG 75)
PSIG is always ______ than PSIA. - ANSWER Lower (Modern Refrigeration PG
75)
What is the absolute atmosphere pressure (psia) at sea level? - ANSWER 14.7
psia (Modern Refrigeration PG 75 and 1537)
What is the formula for gas absolute pressure? - ANSWER Gauge pressure +
atmospheric pressure (14.7)
(Modern Refrigeration PG 75)
What law describes the relationship between the pressure and volume of a gas if the
temperature remains constant? - ANSWER Boyle's Law (Modern Refrigeration PG
78)
, Refrigeration components under evaporator pressure are located on the
___________ - ANSWER Low side (Modern Refrigeration PG 86)
HVACR high side pressure can also be called_____________. - ANSWER All of
these
Condenser pressure
Head pressure
Discharge pressure (Modern Refrigeration PG 86)
What are the basic parts of a refrigeration system - ANSWER Evaporator: Absorbs
heat into the refrigerant. (low side vapor)
Compressor: Divider between low and high sides. Compresses refrigerant increasing
pressure and temperature (high side vapor)
Condenser: Removes latent heat from refrigerant condensing it into a high pressure
liquid. (high side liquid)
Metering Device: Controls the flow of refrigerant into the evaporator. (low side liquid)
(Modern Refrigeration PG 87)
Which of these components separates the low pressure liquid side from the high
pressure side in a refrigerant system? - ANSWER Compressor (Modern
Refrigeration PG 88)
Which condensers requires head pressure? - ANSWER Forced-air condensers
Water-cooling condenser
Natural-convection condensers
(Modern Refrigeration PG 90)
What component removes latent heat from the refrigerant vapor in a refrigerant
system? - ANSWER The condenser (Modern Refrigeration PG 90)
What is the liquid refrigerant that flashes (changing density) to a vapor because of
the pressure drop in an expansion device? - ANSWER Flash gas (Modern
Refrigeration PG 90)
What refrigerant component is capable of storing all of the refrigerant? - ANSWER
Liquid receiver (Modern Refrigeration PG 90)
What refrigeration component is capable of storing all the refrigerant? - ANSWER
Liquid Receiver (Modern Refrigeration PG 90)
A/n__________ is a heat-exchanging device that absorbs heat into its refrigerant. -
ANSWER Evaporator (Modern Refrigeration PG 93)
Section 3: Service Basics - ANSWER Tabs: Tools (PG 99), Tap Drill Sizes (PG
111), Copper Tubing (PG 129), Brazing (PG 147)
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