Refrigeration Operator Exam Questions
and Answers
What is absolute zero? - Answer- the temperature at which all molecular activity stops
What is saturated steam - Answer- steam that is fully saturated with latent heat and has
no water particles
Backflow Preventer - Answer- A check valve that prevents water from flowing back into
a system and contaminating it.
Provide for legal interpretation - Answer- The purpose of codes and standards in
industry
Gauge Pressure - Answer- the pressure in a closed vessel as registered on a pressure
gauge
The first law of thermodynamics - Answer- heat and work are mutually convertible
(work=heat)
Second law of thermodynamics - Answer- natural heat will only flow from hot to cold
What is energy? - Answer- the capacity of a body to do work
What is velocity? - Answer- Rate of change of your position
What is acceleration? - Answer- the rate of change of velocity
What is compression ratio? - Answer- Discharge divided by suction
What is Mass? - Answer- the quantity of matter that a body contains
What is force? - Answer- Any action on a body who tends to change:
Size, Shape or State
What is kenetic energy? - Answer- The ability of a body to do work due to its motion
What is potential energy? - Answer- the ability of a body to do work by virtue of its
position
Welding - Answer- the joining of two or more pieced of metal by the application of heat
and sometimes pressure
, Arc welding - Answer- the process of fusion is obtained by heating with an electric arc(s)
Braze welding - Answer- a form of fusion welding where the base metal is not fused but
is heated bu an oxyacetylene torch
What is an oxidizing agent? - Answer- A chemical substance that can supply to react
with hydrogent or with metals
What is a reducing agent? - Answer- fuels in the combustion process where they
combine with an oxidizing agent
temperature - Answer- a measure of the molecular activity occurring within a substance
the four class letters, shapes and colour code of a fire extinguisher - Answer- Green
triangle - A - ordinary combustibles
Red Square - B - Flammable Liquids
Blue Circle - C - Electrical
Yellow Star - D - combustible metals
The 7 most important physical elements of a refrigerant - Answer- Density
Odour
leakage tendency
Miscibility
Moisture Reaction
Flammability
Toxicity
The 6 types of pipe joints - Answer- Soldered
Screwed
Flanged
Flared
Brazed
Welded
the 7 units of measurements on a psychometric chart - Answer- Dry bulb temperature
Wet bulb temperature
Relative humidity
Specific Humidity
Dew-point
Specific volume
enthalpy
5 accessories air handling units are equipped with - Answer- Fan
Filters
Humidifier
and Answers
What is absolute zero? - Answer- the temperature at which all molecular activity stops
What is saturated steam - Answer- steam that is fully saturated with latent heat and has
no water particles
Backflow Preventer - Answer- A check valve that prevents water from flowing back into
a system and contaminating it.
Provide for legal interpretation - Answer- The purpose of codes and standards in
industry
Gauge Pressure - Answer- the pressure in a closed vessel as registered on a pressure
gauge
The first law of thermodynamics - Answer- heat and work are mutually convertible
(work=heat)
Second law of thermodynamics - Answer- natural heat will only flow from hot to cold
What is energy? - Answer- the capacity of a body to do work
What is velocity? - Answer- Rate of change of your position
What is acceleration? - Answer- the rate of change of velocity
What is compression ratio? - Answer- Discharge divided by suction
What is Mass? - Answer- the quantity of matter that a body contains
What is force? - Answer- Any action on a body who tends to change:
Size, Shape or State
What is kenetic energy? - Answer- The ability of a body to do work due to its motion
What is potential energy? - Answer- the ability of a body to do work by virtue of its
position
Welding - Answer- the joining of two or more pieced of metal by the application of heat
and sometimes pressure
, Arc welding - Answer- the process of fusion is obtained by heating with an electric arc(s)
Braze welding - Answer- a form of fusion welding where the base metal is not fused but
is heated bu an oxyacetylene torch
What is an oxidizing agent? - Answer- A chemical substance that can supply to react
with hydrogent or with metals
What is a reducing agent? - Answer- fuels in the combustion process where they
combine with an oxidizing agent
temperature - Answer- a measure of the molecular activity occurring within a substance
the four class letters, shapes and colour code of a fire extinguisher - Answer- Green
triangle - A - ordinary combustibles
Red Square - B - Flammable Liquids
Blue Circle - C - Electrical
Yellow Star - D - combustible metals
The 7 most important physical elements of a refrigerant - Answer- Density
Odour
leakage tendency
Miscibility
Moisture Reaction
Flammability
Toxicity
The 6 types of pipe joints - Answer- Soldered
Screwed
Flanged
Flared
Brazed
Welded
the 7 units of measurements on a psychometric chart - Answer- Dry bulb temperature
Wet bulb temperature
Relative humidity
Specific Humidity
Dew-point
Specific volume
enthalpy
5 accessories air handling units are equipped with - Answer- Fan
Filters
Humidifier
