EPA 608 609 - EPA Refrigerant Handling Certification EPA 608 Type II Practice Test 1

Question 1

Under current EPA Section 608 regulations, Type II commercial refrigeration equipment containing more than 50 pounds of refrigerant must be repaired when the annual leak rate exceeds what percentage?

Accepted Answer

20%

Answer

10%

Answer

35%

Answer

50%

Question 2

When using EPA-certified recovery equipment manufactured after November 15, 1993, what is the minimum recovery level required (in inches of mercury vacuum) for a Type II system with a refrigerant charge of 200 pounds or more?

Accepted Answer

10 in Hg

Answer

0 in Hg (atmospheric pressure)

Answer

4 in Hg

Answer

25 in Hg

Question 3

A technician measures the liquid line temperature on a Type II R-22 system at 95°F. The high-side gauge reads 278 psig, which corresponds to a saturation temperature of 110°F. What is the subcooling value?

Accepted Answer

15°F

Answer

5°F

Answer

25°F

Answer

205°F

Question 4

A Type II rooftop air conditioning unit is operating with low suction pressure, abnormally high superheat (above 30°F), low discharge pressure, and reduced cooling capacity. What is the most likely cause?

Accepted Answer

Insufficient refrigerant charge (undercharge)

Answer

Overcharge of refrigerant

Answer

Dirty condenser coil restricting airflow

Answer

Metering device stuck in the open position

Question 5

When charging a Type II system with the zeotropic blend R-410A from a cylinder, why must the refrigerant be charged in the liquid phase rather than as a vapor?

Accepted Answer

Vapor charging causes fractionation, altering the blend's composition as it enters the system

Answer

Liquid refrigerant is warmer and reduces the risk of freeze-up during charging

Answer

Liquid charging is faster and reduces the risk of overcharging the system

Answer

Vapor from R-410A cylinders is at too low a pressure to enter the system

Question 6

What is the primary function of a liquid line filter drier in a Type II refrigeration system?

Accepted Answer

To remove moisture and contaminants from the refrigerant before the metering device

Answer

To add superheat to the refrigerant vapor before it reaches the compressor

Answer

To increase subcooling by cooling the liquid line refrigerant

Answer

To regulate refrigerant flow rate through the high side of the system