Test Study Flashcards
Name three types of metering devices.
- Capillary tube
- Thermostatic expansion valve
- Automatic expansion valve
If the contamination from a burned out compressor reaches the new compressor, the new compressor
will probably:
Burn out
What are the three main functions of a TXV:
a. Provide a constant amount of evaporator superheat
b. Keep the entire evaporator full of regrigerant
c. Prevent floodback of refrigerant to the compressor
d. ALL OF THE ABOVE
Air can enter a refigeration system in what three ways:
A. through leaks
b. poor charging procedures
C. poor recovery procedures
What will be the effect on a refrigeration system if too small a diameter of tubing is used for the capillary control?
The evaporator will starve
Oil removed from a system should be handled carefully because?
It can cause skin burns
Name two devices used to detect refrigerant leaks in a system.
a. Ultraviolet detection
b. Halide torch leak
c. Electronic leak detector
Can a refrigerant be reused after a burnout?
No
Why is it necessary to have superheat in a refrigeration system?
To ensure refrigerant is in a vapor state
What does the term TEWI mean:
Total Equivelant Warming Impact
What does the term CAA stand for:
Clean air act
How many classes is the CAA divided into:
2
Section 608 of the CAA prohibits individuals from knowingly doing what.
Knowingly venting off refrigerants into the atmosphere
The EPA has established a mandatory technician certification program, which has how many tipes or certifications?
4
According to the EPA equipment used for the recovery and recycling of refrigerant must be equipment with what:
Low-loss fittings
Name the four stages of refrigeration cycle:
- Expansion
- Evaporation
- Compression
- Condensation
The heat energy that causes a liquid refrigerant to change to a vapor at a constant saturation temperature for a given pressure, is called :
Latent heat
_________Is the pressure at which the refrigerant changes state from a vapor to a liquid.
Condensing pressure
__________ is the pressure at which the refrigerant changes state from a liquid to a vapor.
Evaporating pressure
The _________ function is to circulate refrigerant.
Compressor’s
What is the function of the discharge line?
To carry high pressure superheated vapor from the compressor discharge valve to the entarce of the condenser
What does the receiver do in a refrigeration system?
Acts as a surge tank
What does the liquid line do in the refrigeration system?
Transports high pressure subcooled liquid to the metering device
The metering device is a restriction that separates the high pressure side from the________ side in a refrigeration system.
Low side
