Term
| When moisture is present in a refrigeration system, it will react with the refrigerant and the oil to form? |
|
Definition
|
|
Term
| Which of the following represents the lowest vacuum? |
|
Definition
|
|
Term
| To pull a vacuum means to ? |
|
Definition
| Lower the pressure in a refrigeration system below atmospheric. |
|
|
Term
|
Definition
indicates pressure above 14.696 psia
indicates pressures in inches HG below atmospheric pressure
is one of the two gauges on a typical gauge manifold
all of the above
|
|
|
Term
| A micron gauge is used to measure? |
|
Definition
| absolute pressure below 1 mm Hg. |
|
|
Term
| The best method of leak checking is when the refrigeration system is? |
|
Definition
| standing with dry nitrogen pressure of 150 psig in the system. |
|
|
Term
|
Definition
| are undesirable in a refrigeration system. |
|
|
Term
| What is the most accurate instrument for checking a deep vacuum? |
|
Definition
|
|
Term
| To ensure accurate testing, the best material to use for connecting lines to the vacuum pump and gauge set is? |
|
Definition
|
|
Term
| A multiple evacuation means that? |
|
Definition
| you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure. |
|
|
Term
Moisture in a liquid state must be?
before it can be removed with a vacuum pump. |
|
Definition
|
|
Term
| How many chlorine atoms does it take to destroy 100,000 ozone molecules in the atmosphere? |
|
Definition
|
|
Term
| Which of the following refrigerants is a CFC-type refrigerant? |
|
Definition
|
|
Term
Which of the following is an example of an HCFC refrigerant?
R-12
R-123
R-134
R-22 |
|
Definition
|
|
Term
Which of the following refrigerants is considered an HFC-type of refrigerant?
R-134a
R-12
R-22
R-11 |
|
Definition
|
|
Term
Which type of refrigerant has the highest Ozone Depletion Potential (ODP)?
HFC
HCFC
CFC
all have the same ODP |
|
Definition
|
|
Term
What effect is ozone depletion having on the environment?
increased ground level ozone (smog)
reduced marine life
reduced crop fields
All of the above
|
|
Definition
|
|
Term
The abbreviation for refrigerants containing chlorine, fluorine, and carbon is?
HFC
HCFC
CFC
HFAC |
|
Definition
|
|
Term
The abbreviation for refrigerants containing chlorine, fluorine,carbon, and hydrogen is?
HFC
HCFC
CFC
HFAC |
|
Definition
|
|
Term
The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is?
HFC
HCFC
CFC
HFAC |
|
Definition
|
|
Term
To reprocess refrigerant to meet new product specifications is called?
recovery
renew
reclaim
recycle |
|
Definition
|
|
Term
To clean refrigerant by use of filter dryers is called?
recovery
renew
reclaim
recycle |
|
Definition
|
|
Term
To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called?
recovery
renew
reclaim
recycle
|
|
Definition
|
|
Term
Refrigerants that are made up of two refrigerants that, when blended in the right proportions, combine to make a third stable refrigerant, are called?
blends
azeotropes
near azeotropes
mixtures |
|
Definition
|
|
Term
The ozone depletion factor of R-12 is?
.08
0.016
0.05
1.0 |
|
Definition
|
|
Term
| If a critically charged refrigeration system is over charged, which of the following is a likely result? |
|
Definition
| increased operating pressures |
|
|
Term
| Fractionation occurs when? |
|
Definition
| some of a blended refrigerant evaporates or condenses before the rest of the blend. |
|
|
Term
| When charging a refrigeration system with a near-azeotropic mixture while running, what must be done to prevent liquid from entering the system? |
|
Definition
| charge as a liquid through the low side using a restrictor. |
|
|
Term
| Charging a refrigeration system refers to ? |
|
Definition
| adding refrigerant to a system |
|
|
Term
If 22oz. of refrigerant are to be added a to refrigeration system and the supply cylinder weighs 24 lb. 12 oz.
before any is added, what will be the supply cylinder weight after the system has been charged? |
|
Definition
|
|
Term
| If 30 oz. if refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 12 oz. before any is added, what will the supply cylinder weigh after the system has been charged? |
|
Definition
|
|
Term
Refrigerant in liquid form is normally put into the system through the?
liquid line
suction line
hot gas line
liquid return line |
|
Definition
|
|
Term
| Refrigerant in vapor form is normally put into the system through the? |
|
Definition
|
|
Term
| When charging a system with vapor refrigerant from a refrigerant cylinder the cylinder will become? |
|
Definition
|
|
Term
| When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed? |
|
Definition
| in the position indicated on the cylinder |
|
|
Term
| A graduated cylinder charging device is a device that? |
|
Definition
measures refrigerant by volume for precise refrigerant charging
has a compensation dial for adjusting for the temperature of the refrigerant
often has a heater to keep the refrigerant temp from dropping when the refrigerant is released into the system |
|
|
Term
| The factory charge in a split system, using R-22 shows 6 lb. 8 oz. in the outdoor condensing unit and 2 oz. in the evaporator. The 3/8" liquid line contains 0.48 oz. per foot and the 7/8" suction line contains 0.10 oz. per foot. The refrigerant lines are 30' long. What is the correct refrigerant charge for this system? |
|
Definition
|
|
