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WorksheetsBlock 12
Total questions: 57
Worksheet time: 29mins
____ is a process that controls the temperature, circulation, humidity and purity of the air
Filtering
Air Conditioning
Refrigeration
Pumpdown
____ is a process that reduces temperature by removing and transferring heat
Filtering
Air Conditioning
Refrigeration
Pumpdown
____ is a process in which most refrigerant is removed from the low side of a refrigerant system
Filtering
Air Conditioning
Refrigeration
Pumpdown
___ is an expression of energy; typically measured by temperature
Heat
Refrigeration
Conduction
Pumpdown
Heat transfers from a ___ substance to a ___ substance
Warmer - Cooler
Cooler - Warmer
Solid - liquid
Liquid - soild
____ is the transfer of heat energy through a solid object
Conduction
Convection
Radiation
Heat Intensity
____ is the transfer of heat energy through the movement of a liquid or gas
Conduction
Convection
Radiation
Heat Intensity
____ is the transfer of heat energy by direct rays or waves
Conduction
Convection
Radiation
Heat Intensity
____ is the temperature of a substance as measured in degrees with a thermometer
Sensible Heat
Convection
Heat Quantity
Heat Intensity
____ is the amount of heat energy as calculated in British Thermal Units (BTU) or tons
Sensible Heat
Convection
Heat Quantity
Heat Intensity
1 BTU = ?
The amount of heat required to raise the temperature of 1 pound of liquid water by 1°F at atmospheric pressure
The amount of heat required to raise the temperature of 1 gram of liquid water by 1°F
The amount of heat required to raise the temperature of 1 pound of liquid water by 1°C at atmospheric pressure
1 ton of cooling capacity
12,000 BTUs = ___ ton of cooling capacity
1 Ton
5 tons
10 tons
3 tons
The BTU is a measure of ____
Heat Load Capability
Thermal Energy
Power Output
Cooling Efficiency
_____ is heat energy that is added or removed to cause a change in temperature
Sensible Heat
Latent Heat
Heat Quantity
Superheat
_____ is heat energy that is added or removed to cause a change in state; no change in temperature occurs
Sensible Heat
Latent Heat
Heat Quantity
Superheat
_____ is heat energy that is added to a gas or vapor; a form of sensible heat
Sensible Heat
Latent Heat
Heat Quantity
Superheat
Once water has boiled into a vapor, heat is added to the vapor to increase its sensible heat.
THIS IS AN EXAMPLE OF WHAT?
Sensible Heat
Latent Heat
Heat Quantity
Superheat
A change of state is always accomplished by a ___
Gain or loss of heat
Gain or loss of coldness
Gain or loss of R-12
Change in temperature
____ is the point at which any additional heat, added or removed will cause a change in state
Saturation Point
Boiling Point
Heat Intensity
Condensing
____ is the transition point between sensible heat and latent heat
Saturation Point
Boiling Point
Heat Intensity
Condensing
____ is the saturation point at which a liquid will change to a gas or vapor
Saturation Point
Boiling Point
Heat Intensity
Condensing
Increase in pressure will ___ the boiling point
Raise
Lower
stasis
Decrease in pressure will ___ the condensation point
Raise
Lower
stasis
____ is a change in state from a gas or vapor to a liquid by removing heat energy
Saturation Point
Boiling Point
Heat Intensity
Condensing
____ is the saturation point at which a gas or vapor will change to a liquid
Saturation Point
Boiling Point
Condensing point
Condensing
Pressure Temperature Chart allows ____
A refrigerant technician to determine the saturation point for a refrigerant to calculate superheat
Accurate identification of refrigerant pressure at specific temperatures
Monitoring of system performance and diagnosing potential issues
The calculation of subcooling for efficient system operation
Calculating superheat is accomplished by comparing _____
The refrigerant suction temperature with the saturation temperature for a refrigerant at a known pressure
The discharge temperature with the ambient air temperature
The suction pressure with the discharge pressure of the system
The refrigerant suction temperature with the evaporator coil temperature
What is one of the safety measures to take when handling refrigerants?
Ensure adequate ventilation
Use open flames
Store cylinders in a hot area
Leave valves uncapped when running
Which type of gloves should be worn for refrigerant safety?
Cotton gloves
Butyl-lined gloves
Leather gloves
Rubber gloves
Where should refrigerant cylinders be stored?
In direct sunlight
In a damp place
Near a heat source
In a cool, dry area
What should be done to refrigerant valves when not in use?
Leave them open
Remove them
Cap them off
Paint them
Why should refrigerant cylinders be secured?
To keep them from falling over
To make them easier to move
To prevent theft
To improve cooling efficiency
What does the expansion valve do to liquid refrigerant?
Increases pressure and temperature
Decreases pressure and temperature
Converts refrigerant to vapor
Removes heat from refrigerant
What is the result of a decrease in pressure caused by the expansion valve?
The boiling point of the refrigerator decreases
The boiling point of the refrigerant increases
The refrigerant changes to a solid
The refrigerant releases heat
The ____ is responsible for heat load removal
Air Conditioner
Evaporator
Refrigerator
Compressor
The expansion valve is used in many systems to meter _____
Refrigerant flow to evaporator
Refrigerant flow to the condenser
Heat from the evaporator
Refrigerant flow to the compressor
____ increases pressure and temperature of refrigeration vapor
Compressor
Evaporator
Condenser
Expansion Valve
____ Increases condensing point of refrigerant vapor
Compressor
Evaporator
Condenser
Expansion Valve
Which type of compressor is at risk of burning out if run with no refrigerant in the system?
Open-drive compressor
Hermetically sealed compressor
Both types of compressors
None of the above
What issue is a common concern with open-drive compressors? / what are they susceptible too?
Overheating due to pressure buildup
Inadequate metering of refrigerant flow
Leaks around shaft seals
Reduced heat absorption
In the refrigeration system what side is heat load removal?
Left
Right
Low/Suction
High/Discharge
In the refrigeration system what side is refrigerant condensation & storage?
Left
Right
Low/Suction
High/Discharge
____ Stores liquid refrigerant under pressure (HPL)
Receiver
Evaporator
Refrigerator
Compressor
____ Removes heat from refrigerant vapor and Causes change in state from gas to liquid
Receiver
Evaporator
Condenser
Compressor
The compressor takes in ___ and produces ___
LPG & HPG
HPG & LPG
LPL & HPL
HPL & LPL
What are the 2 kinds of Compressors?
(Select all that apply)
Hermetically Sealed
Open-Drive
Condensing Type
Low-pressure
What type of heat transfer occurs when heat is carried through movement of a liquid or gas?
Convection
Conduction
Radiation
Evaporation
Always cap off ____ when not in use
Refrigerant service valves
Water Faucets
Gas Supply Lines
Expansion Valves
The temperature of liquid refrigerant is lowered by the
Compressor
Evaporator
Condenser
Expansion Valve
What component will lower the pressure of the liquid refrigerant?
Compressor
Evaporator
Condenser
Expansion Valve
Increasing the boiling point of refrigerant is accomplished by increasing the _____ of the liquid refrigerant.
Temperature
Pressure
Volume
Density
Heat energy is absorbed in the?
Air Conditioner
Evaporator
Refrigerator
Compressor
What happens to the liquid refrigerant when heat is absorbed?
Boils into gas or vapor
Freezes
It condenses
Remains unchanged
The compressor will increase the _____ point by increasing the pressure of the vapor refrigerant.
Condensing
Boiling
Melting
Freezing
The compressor will raise the temperature of the vapor refrigerant to approximately ____ above ambient
temperature.
30°F
10°F
15°F
45°F
In the _____ high pressure vapor refrigerant
gives up heat energy to ambient air.
Compressor
Evaporator
Condenser Coil
Expansion Valve
When the high-pressure refrigerant vapor gives up heat to ambient air, it will change state to a ___ refrigerant.
HPL
LPL
LPG
HPG
