CFESA-RSES TM1-Practice Questions
Well Answered 2026 Update.
What is the function of any type of refrigeration Compressor?
: - Answer To compress low-temperature, heat-laden
gas into high-temperature, high-pressure
gas.
Name three types of water-cooled condensers. - Answer Tube-in-tube, shell and tube, shell
and coil
When was RSES founded? - Answer March 9, 1933
The process of a solid turninq directly into a
vapor without going to a liquid stage is called - Answer Sublimation.
The heat energy required to change a liquid to a vapor is called. - Answer Latent heat of
vaporization.
Define a Btu and a calorie. - Answer A Btu is the amount of heat required to raise one pound
of water one degree Fahrenheit. A calorie is the amount of heat required to raise one gram of
water one degree Celsius.
What is the specific heat of ice? - Answer 0.48
In refrigeration, heat energy is used to calculate______ - Answer Enthalpy.
What are the disadvantages of superheated
suction gas? - Answer a) The specific volume of the gas increases and has a direct effect on
reducing compressor capacity
b) The temperature of the gas increases, with a resultant increase in the temperature of the
compressor discharge gas.
c) Gas-cooled compressor motors need cool gas for extended life.
If a pound of refrigerant absorbs 50 Btu in the evaporator, how many pounds per minute are
circulated in a 2-ton system? - Answer 8 200 btu's/min divided by 50 = 4,, 4 * 2 tons = 8
lbs/min
, Define compression ratio - Answer The ratio of absolute discharged pressure to,
absolute suction pressure, both in PSIA.
Why is a low compression ratio desirable? - Answer It means lower power consumption.
How many cubic inches of mercury equal one pound? - Answer 2.036 (By dividing 29.92 by
14.696 you come up with the correct answer)
How do you convert a pressure of 14.696 PSIA to inches of mercury? - Answer 2.036 * 14.696
= 29.921 inches of mercury.
How can barometric pressure in inches of
mercury be converted to PSIA? - Answer Divide barometric pressure by 2.036.
What is the term applied to liquids that normally boil at temperatures, below room
temperature? - Answer Volatile liquids.
In general practice, how much cooler is the condensing medium than the high-pressure gas in
the condenser? - Answer 20 to 40°
Allowing a difference of 20° between condensing air and gas in the condenser, what is the
condensing temperature if the available cooling air is 90°F? - Answer 110 F
What is the volumetric efficiency of a compressor that has a displacement of 20 cfm and is
actually pumping 16 cfm? - Answer = 0.8 * 100 = 80%
What is the result of suction superheat on compressor capacity? - Answer A loss in capacity
Give three reasons why it is desirable to have some suction superheating. - Answer 1) To
assure against liquid slugging to the compressor.
2) To reduce the loss of refrigeration from the cold suction line to the warm room.
3) To prevent condensation of the suction line.
Name one method used to produce liquid subcooling. - Answer Liquid line-to-suction line heat
exchanger.
Well Answered 2026 Update.
What is the function of any type of refrigeration Compressor?
: - Answer To compress low-temperature, heat-laden
gas into high-temperature, high-pressure
gas.
Name three types of water-cooled condensers. - Answer Tube-in-tube, shell and tube, shell
and coil
When was RSES founded? - Answer March 9, 1933
The process of a solid turninq directly into a
vapor without going to a liquid stage is called - Answer Sublimation.
The heat energy required to change a liquid to a vapor is called. - Answer Latent heat of
vaporization.
Define a Btu and a calorie. - Answer A Btu is the amount of heat required to raise one pound
of water one degree Fahrenheit. A calorie is the amount of heat required to raise one gram of
water one degree Celsius.
What is the specific heat of ice? - Answer 0.48
In refrigeration, heat energy is used to calculate______ - Answer Enthalpy.
What are the disadvantages of superheated
suction gas? - Answer a) The specific volume of the gas increases and has a direct effect on
reducing compressor capacity
b) The temperature of the gas increases, with a resultant increase in the temperature of the
compressor discharge gas.
c) Gas-cooled compressor motors need cool gas for extended life.
If a pound of refrigerant absorbs 50 Btu in the evaporator, how many pounds per minute are
circulated in a 2-ton system? - Answer 8 200 btu's/min divided by 50 = 4,, 4 * 2 tons = 8
lbs/min
, Define compression ratio - Answer The ratio of absolute discharged pressure to,
absolute suction pressure, both in PSIA.
Why is a low compression ratio desirable? - Answer It means lower power consumption.
How many cubic inches of mercury equal one pound? - Answer 2.036 (By dividing 29.92 by
14.696 you come up with the correct answer)
How do you convert a pressure of 14.696 PSIA to inches of mercury? - Answer 2.036 * 14.696
= 29.921 inches of mercury.
How can barometric pressure in inches of
mercury be converted to PSIA? - Answer Divide barometric pressure by 2.036.
What is the term applied to liquids that normally boil at temperatures, below room
temperature? - Answer Volatile liquids.
In general practice, how much cooler is the condensing medium than the high-pressure gas in
the condenser? - Answer 20 to 40°
Allowing a difference of 20° between condensing air and gas in the condenser, what is the
condensing temperature if the available cooling air is 90°F? - Answer 110 F
What is the volumetric efficiency of a compressor that has a displacement of 20 cfm and is
actually pumping 16 cfm? - Answer = 0.8 * 100 = 80%
What is the result of suction superheat on compressor capacity? - Answer A loss in capacity
Give three reasons why it is desirable to have some suction superheating. - Answer 1) To
assure against liquid slugging to the compressor.
2) To reduce the loss of refrigeration from the cold suction line to the warm room.
3) To prevent condensation of the suction line.
Name one method used to produce liquid subcooling. - Answer Liquid line-to-suction line heat
exchanger.
