J/E Refrigeration GRADE A Q&A
A gas fired furnace relies upon ________ to take the heat of the flame thru the metal of
its heat exchanger, to the air passing thru it - (correct answer)Conduction
The state of the refrigerant leaving the condenser of a refrigeration system is - (correct
answer)High pressure liquid
When heat is moved, the temperature of the substance it moved from is - (correct
answer)Lowered, Decreased
What occurs to the temperature of the refrigerant as it passes through the TXV - (correct
answer)Decreases
Describe the operation of a refrigeration unit that is low on refrigerant - (correct
answer)Will run continuously without lowering the temperature
Describe the condition of the refrigerant as it leaves the evaporator - (correct
answer)Low Temp, Low Pressure, Superheated gas mixture
List the four forms of energy that turn into heat energy in air conditioned (cooled)
spaces - (correct answer)Light, Electrical, Mechanical, Chemical
Describe the procedure for admitting fresh air to a HVAC for the greatest efficiency -
(correct answer)As little as possible for proper ventilation
Define refrigeration - (correct answer)Cooling by removing heat
If some refrigerants are burned, what is the result - (correct answer)Phosgene gas,
(toxic), CFC's
, What do you check first when the compressor does not start - (correct answer)Motor
circuit fuses
To the refrigerant technician the most important type of heat is - (correct answer)Latent
Describe the condition of the refrigerant as it enters the liquid metering device - (correct
answer)High Temp, High Pressure, Subcooled Liquid
Describe the condition of the refrigerant as it leaves the liquid metering device - (correct
answer)Low Temp, Low Pressure, Saturated liquid/vapor mixture
Describe the condition of the refrigerant as it leaves the condenser - (correct
answer)Less High Temp, High Pressure, Subcooled Liquid
List examples where mechanical refrigeration is used - (correct answer)Home A/C,
Fridge, Coolers, Freezers
Describe the procedure for charging refrigerant - (correct answer)Purge charging lines
What chemical found in the upper stratosphere indicates that the ozone layer is being
destroyed - (correct answer)Chlorine Monoxide
1 ton of refrigeration capacity or cooling load is - (correct answer)12,000 Btuh
Where does the refrigerant absorb the latent heat of vaporization - (correct
answer)Evaporator
As the temperature of any substance increases, the molecules which make it up vibrate
- (correct answer)Faster
A gas fired furnace relies upon ________ to take the heat of the flame thru the metal of
its heat exchanger, to the air passing thru it - (correct answer)Conduction
The state of the refrigerant leaving the condenser of a refrigeration system is - (correct
answer)High pressure liquid
When heat is moved, the temperature of the substance it moved from is - (correct
answer)Lowered, Decreased
What occurs to the temperature of the refrigerant as it passes through the TXV - (correct
answer)Decreases
Describe the operation of a refrigeration unit that is low on refrigerant - (correct
answer)Will run continuously without lowering the temperature
Describe the condition of the refrigerant as it leaves the evaporator - (correct
answer)Low Temp, Low Pressure, Superheated gas mixture
List the four forms of energy that turn into heat energy in air conditioned (cooled)
spaces - (correct answer)Light, Electrical, Mechanical, Chemical
Describe the procedure for admitting fresh air to a HVAC for the greatest efficiency -
(correct answer)As little as possible for proper ventilation
Define refrigeration - (correct answer)Cooling by removing heat
If some refrigerants are burned, what is the result - (correct answer)Phosgene gas,
(toxic), CFC's
, What do you check first when the compressor does not start - (correct answer)Motor
circuit fuses
To the refrigerant technician the most important type of heat is - (correct answer)Latent
Describe the condition of the refrigerant as it enters the liquid metering device - (correct
answer)High Temp, High Pressure, Subcooled Liquid
Describe the condition of the refrigerant as it leaves the liquid metering device - (correct
answer)Low Temp, Low Pressure, Saturated liquid/vapor mixture
Describe the condition of the refrigerant as it leaves the condenser - (correct
answer)Less High Temp, High Pressure, Subcooled Liquid
List examples where mechanical refrigeration is used - (correct answer)Home A/C,
Fridge, Coolers, Freezers
Describe the procedure for charging refrigerant - (correct answer)Purge charging lines
What chemical found in the upper stratosphere indicates that the ozone layer is being
destroyed - (correct answer)Chlorine Monoxide
1 ton of refrigeration capacity or cooling load is - (correct answer)12,000 Btuh
Where does the refrigerant absorb the latent heat of vaporization - (correct
answer)Evaporator
As the temperature of any substance increases, the molecules which make it up vibrate
- (correct answer)Faster
