Refrigeration Machine Operator Exam
Questions with Complete Solutions
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
heating and cooling
motorized dampers
4 methods of heat recovery in an air conditioning unit - Answer-Heat pipe
Heat pump
Thermal Wheel
Runaround system
Convection - Answer-When heat is transmitted by hot gasses
Superheated - Answer-When saturated vapour is given additional heat, raising it above
temperature of saturation
conduction - Answer-When heat is exchanged by travelling through metal
high pressure limit - Answer-the switch that prevents a compressor from reaching too
high discharge pressure
specific heat - Answer-the change in length per unit length per degree rise in
temperature
Questions with Complete Solutions
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
heating and cooling
motorized dampers
4 methods of heat recovery in an air conditioning unit - Answer-Heat pipe
Heat pump
Thermal Wheel
Runaround system
Convection - Answer-When heat is transmitted by hot gasses
Superheated - Answer-When saturated vapour is given additional heat, raising it above
temperature of saturation
conduction - Answer-When heat is exchanged by travelling through metal
high pressure limit - Answer-the switch that prevents a compressor from reaching too
high discharge pressure
specific heat - Answer-the change in length per unit length per degree rise in
temperature
