CM 411 Midterm 2 Exam Questions With Accurate Solutions Graded A+
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Course
CM 411
Institution
CM 411
The pressure of the atmosphere on the mercury in the open dish prevents mercury in the tube from ___ - CORRECT ANSWER-Running out
Heat flows from the hot __ to the __ condensing medium operating refrigeration system - CORRECT ANSWER-refrigerant vapor; cold
The second digit in a two-digit refr...
CM 411 Midterm 2 Exam Questions With
Accurate Solutions Graded A+
The pressure of the atmosphere on the mercury in the open dish prevents mercury in
the tube from ___ - CORRECT ANSWER-Running out
Heat flows from the hot __ to the __ condensing medium operating refrigeration system
- CORRECT ANSWER-refrigerant vapor; cold
The second digit in a two-digit refrigerant number represents the number of ____ atoms
in each molecule of the refrigerant - CORRECT ANSWER-fluorine
Minute pressure changes can be expressed in ___ of water column - CORRECT
ANSWER-inches
Because the refrigerant absorbs heat from the compression process, the refrigerant that
leaves the compressor is ___ than the refrigerant in the rest of the system - CORRECT
ANSWER-hotter
A refrigerant should be miscible with ___ - CORRECT ANSWER-oil
___ have a purge unit to remove "non-condensables" from the system. - CORRECT
ANSWER-Low-pressure chillers
___ compressors used in chillers are large capacity, positive-displacement compressors
that have few moving parts. - CORRECT ANSWER-Rotary screw
, Low-pressure chillers normally use an orifice-type or a float type ___ - CORRECT
ANSWER-metering device
The sensor for the ___ is a thermistor mounted in the liquid line from the evaporator to
monitor the temperature of the refrigerant vapor - CORRECT ANSWER-EXVs
The water returning to the chiller from the building is normally at a temperature of about
___ - CORRECT ANSWER-55 degree F
The pressure increases more when the temperature increases because of head added
in the ___ - CORRECT ANSWER-generator
In an absorption system heat is transferred from the ___ medium to the ___ in the
evaporator - CORRECT ANSWER-evaporator; refrigerant
The liquid refrigerant passes through the orifice, causing a pressure ___ - CORRECT
ANSWER-decrease
The temperature of the refrigerant in an absorption refrigeration system is controlled by
the ___ of the refrigerant in the evaporator and the condenser. - CORRECT ANSWER-
pressure
Water and ___ are often used as refrigerant and absorbent in small to medium-size
absorption refrigeration systems. - CORRECT ANSWER-lithium bromide
When the refrigerant leaves the evaporator, it is at a temperature of 41 F with a heat
content of ___ btu/lb - CORRECT ANSWER-1080
Refrigerants that use ___ are believe to be responsible for the depletion of the earth's
ozone layer and may cause global warming - CORRECT ANSWER-chlorofluorocarbons
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