R-410A Test
Because of its higher vapor heat capacity, the discharge temperature of R-410A is ____ than
R-22.
A. Higher
B. Lower
C. The same
D. None of the above - ANSB. Lower
R-410A is also known as:
A. Suva 410A
B. AZ-20
C. Puron
D. All the above - ANSD. All the above
Both suction and discharge pressures of R410a systems are _____ than R22 systems.
A. The same
B. 40% to 70% higher
C. 60% lower
D. 10% to 30% higher - ANSB. 40% to 70% higher
The temperature glide for R-410A is less than ____ degrees Fahrenheit over air conditioning
and refrigerating operating ranges.
A. 0.3
B. 0.9
C. 1.0
D. 1.5 - ANSA. 0.3
Compression ratio is calculated as:
A. Absolute suction pressure divided by absolute discharge pressure
B. Discharge pressure divided by suction pressure
C. Absolute discharge pressure divided by absolute suction pressure
D. Suction pressure divided by discharge pressure - ANSC. Absolute discharge pressure
divided by absolute suction pressure
Polyol Ester (POE):
A. Can be irritating to the skin
B. Is hygroscopic
C. Has improved heat transfer characteristics over mineral oil
D. All the above - ANSD. All the above
The low pressure control on R-410A systems will open at:
, A. 50 psig
B. 30 psig
C. 70 psig
D. 90 psig - ANSA. 50 psig
When a blend is zeotropic, or near-azeotropic (NARM):
A. Leaks may cause a change in the composition of the blend
B. It will have temperature glide
C. It can fractionate
D. All the above - ANSD. All the above
R-410A systems use a high pressure switch that will open at approximately:
A. 500 psig plus or minus 10 psig
B. 610 psig plus or minus 10 psig
C. 730 psig plus or minus 10 psig
D. 840 psig plus or minus 10 psig - ANSB. 610 psig plus or minus 10 psig
A true azeotropic blend
A. Will not fractionate
B. Has no temperature glide
C. Behaves as a single compound refrigerant
D. All the above - ANSD. All the above
Subcooled liquid in the receiver may _____ subcooling,
depending on surrounding conditions
A. Loose
B. Gain
C. Either "A" or "B"
D. Neither "A" or "B" - ANSC. Either "A" or "B"
Which of the following statements is true of R-407C?
A. R-407C is a single component refrigerant
B. It is classified as an azeotropic refrigerant
C. It is a binary blend
D. It may separate (fractionate) into its component refrigerants - ANSD. It may separate
(fractionate) into its component refrigerants
When installing a liquid line filter drier on a R-410A system, be certain that it has a pressure
rating of at least:
A. 500 psig
B. 600 psig
C. 700 psig
D. 800 psig - ANSB. 600 psig
Because of its higher vapor heat capacity, the discharge temperature of R-410A is ____ than
R-22.
A. Higher
B. Lower
C. The same
D. None of the above - ANSB. Lower
R-410A is also known as:
A. Suva 410A
B. AZ-20
C. Puron
D. All the above - ANSD. All the above
Both suction and discharge pressures of R410a systems are _____ than R22 systems.
A. The same
B. 40% to 70% higher
C. 60% lower
D. 10% to 30% higher - ANSB. 40% to 70% higher
The temperature glide for R-410A is less than ____ degrees Fahrenheit over air conditioning
and refrigerating operating ranges.
A. 0.3
B. 0.9
C. 1.0
D. 1.5 - ANSA. 0.3
Compression ratio is calculated as:
A. Absolute suction pressure divided by absolute discharge pressure
B. Discharge pressure divided by suction pressure
C. Absolute discharge pressure divided by absolute suction pressure
D. Suction pressure divided by discharge pressure - ANSC. Absolute discharge pressure
divided by absolute suction pressure
Polyol Ester (POE):
A. Can be irritating to the skin
B. Is hygroscopic
C. Has improved heat transfer characteristics over mineral oil
D. All the above - ANSD. All the above
The low pressure control on R-410A systems will open at:
, A. 50 psig
B. 30 psig
C. 70 psig
D. 90 psig - ANSA. 50 psig
When a blend is zeotropic, or near-azeotropic (NARM):
A. Leaks may cause a change in the composition of the blend
B. It will have temperature glide
C. It can fractionate
D. All the above - ANSD. All the above
R-410A systems use a high pressure switch that will open at approximately:
A. 500 psig plus or minus 10 psig
B. 610 psig plus or minus 10 psig
C. 730 psig plus or minus 10 psig
D. 840 psig plus or minus 10 psig - ANSB. 610 psig plus or minus 10 psig
A true azeotropic blend
A. Will not fractionate
B. Has no temperature glide
C. Behaves as a single compound refrigerant
D. All the above - ANSD. All the above
Subcooled liquid in the receiver may _____ subcooling,
depending on surrounding conditions
A. Loose
B. Gain
C. Either "A" or "B"
D. Neither "A" or "B" - ANSC. Either "A" or "B"
Which of the following statements is true of R-407C?
A. R-407C is a single component refrigerant
B. It is classified as an azeotropic refrigerant
C. It is a binary blend
D. It may separate (fractionate) into its component refrigerants - ANSD. It may separate
(fractionate) into its component refrigerants
When installing a liquid line filter drier on a R-410A system, be certain that it has a pressure
rating of at least:
A. 500 psig
B. 600 psig
C. 700 psig
D. 800 psig - ANSB. 600 psig
