Refrigeration Machine Operator Final
Exam Study Guide Questions and
Answers
Specific Heat is - Answer-the amount of heat necessary to raise the temperature of a
substance one deg F
What are two types of heat - Answer-sensible and latent
Heat flow by conduction is - Answer-energy travelling from one molecule to another
Radiation can be defined as - Answer-transfer of heat through the air without heating
the air and is absorbed by a solid object
Water freezes at - Answer-32 deg f
Refrigeration is - Answer-the tranfer of heat from a place where it is not wanted to a
place where it is less objectionable
Heat flows from - Answer-hot to cold
A btu is - Answer-British Thermal Unit
A btu can be defined as - Answer-the amount of heat required to raise one lb of water
one deg f
What is the definition of temperature - Answer-the measure of the intensity of heat
Absolute zero is - Answer--460 deg f
Atmospheric pressure at sea level is - Answer-14.7 psi
32 deg f equals - Answer-0 deg c
70 deg f equals - Answer-21.1 deg c
100 deg C equals - Answer-212 deg f
Water boils at - Answer-212 deg f
A rise in sensible heat causes - Answer-a change of temperature of a substance
Latent heat causes - Answer-a change of state
, The amount of heat required to raise two pounds of ice two deg f is - Answer-2 btu
As the temperature of a substance increases the molecules in the material - Answer-
travel faster
PSIG indicates - Answer-pounds per square inch gauge
How many btus are required to change one lb of ice at 20 deg f to one lb of steam at
220 deg f - Answer-1304 btu
Which of the following represents a differnet temperature than the other three - Answer-
475 deg k
What is 24 psig in absolute pressure - Answer-38.7 psia
The pressure exerted by a block of steel is - Answer-downward
The latent heat of vaporization of water is - Answer-970.3 btu/lb
the specific heat of ice is - Answer-.5 btu/lb
The specific heat of steel is .116 btu/lb. if we have 1000 lbs of steel that must be heated
to 100 degrees f from 30 degrees f, how many btus are needed? - Answer-8120
How many btus are required to raise 10 lbs of ice from 20 deg f to water at 70 deg f -
Answer-1980
How many btus are required to raise 20 lbs of water from 70 deg f to steam at 250 deg f
- Answer-22,000
Water weighs - Answer-62.4 lbs/ft2
the device used to measure pressure in a closed system is a - Answer-bourdon tube
the purpose of the piping in a refrigeration system is - Answer-to give a path for
refrigerant to flow
Acr pipe is measure in - Answer-outside diameter
Two methods of cutting ACR copper - Answer-tubing cutter and hack saw
a copper flare for refrigeration is - Answer-45 deg
Soft soldering is done at - Answer-500 deg f
Exam Study Guide Questions and
Answers
Specific Heat is - Answer-the amount of heat necessary to raise the temperature of a
substance one deg F
What are two types of heat - Answer-sensible and latent
Heat flow by conduction is - Answer-energy travelling from one molecule to another
Radiation can be defined as - Answer-transfer of heat through the air without heating
the air and is absorbed by a solid object
Water freezes at - Answer-32 deg f
Refrigeration is - Answer-the tranfer of heat from a place where it is not wanted to a
place where it is less objectionable
Heat flows from - Answer-hot to cold
A btu is - Answer-British Thermal Unit
A btu can be defined as - Answer-the amount of heat required to raise one lb of water
one deg f
What is the definition of temperature - Answer-the measure of the intensity of heat
Absolute zero is - Answer--460 deg f
Atmospheric pressure at sea level is - Answer-14.7 psi
32 deg f equals - Answer-0 deg c
70 deg f equals - Answer-21.1 deg c
100 deg C equals - Answer-212 deg f
Water boils at - Answer-212 deg f
A rise in sensible heat causes - Answer-a change of temperature of a substance
Latent heat causes - Answer-a change of state
, The amount of heat required to raise two pounds of ice two deg f is - Answer-2 btu
As the temperature of a substance increases the molecules in the material - Answer-
travel faster
PSIG indicates - Answer-pounds per square inch gauge
How many btus are required to change one lb of ice at 20 deg f to one lb of steam at
220 deg f - Answer-1304 btu
Which of the following represents a differnet temperature than the other three - Answer-
475 deg k
What is 24 psig in absolute pressure - Answer-38.7 psia
The pressure exerted by a block of steel is - Answer-downward
The latent heat of vaporization of water is - Answer-970.3 btu/lb
the specific heat of ice is - Answer-.5 btu/lb
The specific heat of steel is .116 btu/lb. if we have 1000 lbs of steel that must be heated
to 100 degrees f from 30 degrees f, how many btus are needed? - Answer-8120
How many btus are required to raise 10 lbs of ice from 20 deg f to water at 70 deg f -
Answer-1980
How many btus are required to raise 20 lbs of water from 70 deg f to steam at 250 deg f
- Answer-22,000
Water weighs - Answer-62.4 lbs/ft2
the device used to measure pressure in a closed system is a - Answer-bourdon tube
the purpose of the piping in a refrigeration system is - Answer-to give a path for
refrigerant to flow
Acr pipe is measure in - Answer-outside diameter
Two methods of cutting ACR copper - Answer-tubing cutter and hack saw
a copper flare for refrigeration is - Answer-45 deg
Soft soldering is done at - Answer-500 deg f
