EPA 608 Type II Practice Test
The state of a refrigerant leaving a refrigeration system's liquid receiver is:
Correct answer: High-Pressure Liquid
The refrigerant's pressure is constant leaving the refrigerant below the interface subcooled.
When the annualized leak rate reaches _____ or more, leaks in industrial process and refrigeration units must be repaired with a 50-pound charge or larger.
Correct answer: 30%
EPA regulations require that all commercial and industrial process refrigeration containing more than 50 lbs. of refrigerant must be repaired when the annual leak rate exceeds 30%. (Page19 ESCO EPA 9TH V2 Edition Prep Manual)
When evacuating a system, what is the minimum number of microns a vacuum pump must pull?
Correct answer: 500 Microns
A finishing vacuum of 500 microns is acceptable for a new installation or a system being serviced.
A high-pressure appliance with a capacity of less than 200 pounds. The level of an HCFC or HFC refrigerant must be evacuated (recovered) to:
Correct answer: 0 inches of vacuum
A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated (recovered) to a level of 0 inches of vacuum. (Page 20 ESCO EPA 9TH V2 Edition Prep Manual)
Which of the following is commonly contained in refrigerants made before 1950?
Correct answer: SO2
Systems built before 1950 contain sulfur dioxide (SO2), methyl formate, and methyl chloride.
According to EPA standards, removing which component is considered a "major repair"?
Correct answer: Compressor
Under EPA regulations, a ""major repair"" means any maintenance, service or repair involving the removal of any or all of the following components: compressor, condenser, evaporator or an auxiliary heat exchanger coil. (Page 23 ESCO EPA 9TH V2 Edition Prep Manual)
Which of the following is used to prevent transient liquid slugs from getting into the compressor?
Correct answer: Accumulator
An accumulator prevents sudden surges of liquid refrigerant and oil that could enter the compressor from the suction line.
The disposable cylinders must be:
Correct answer: Discarded
It is a violation of Section 608 to dispose of a disposable cylinder without first recovering any remaining refrigerant (to 0 psig.), rendering the cylinder useless, and then recycling the metal. (Page 10 EPA Prep Manual)
Which of the following do the filter driers remove?
Correct answer: Moisture and Particulates
A filter drier is responsible for to absorb system contaminants (moisture) and provide filtration against particulates.
The usage of certified recovery equipment is the first step in using proper recovery practices that is certified by:
Correct answer: EPA approved laboratory
Refrigerant Recovery and/or Recycling equipment manufactured after November 15, 1993, must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
Which of the following cannot be compressed by a compressor?
Correct answer: Liquid
Liquids cannot be compressed.
A high-pressure appliance with 210 pounds of R-407C refrigerant must be evacuated (recovered) to a level of;
Correct answer: 10 inches of vacuum
A high-pressure appliance containing 210 lbs. of R-407C refrigerant must be evacuated (recovered) to a level of 10 inches of vacuum. (Page 20 ESCO EPA 9TH V2 Edition Prep Manual)
For a pressure decay test, using dry ______ is the best leak-checking method.
Correct answer: Nitrogen
Nitrogen can be used to test the system before putting in refrigerant. If the system cannot hold pressure, there may be a leak. Nitrogen should be used to pressurize the system for leak detection.
The unit should first be ______ after the installation of any type of system.
Correct answer: Pressurized with an inert gas and leak checked.
After the installation of any type of system, the unit should first be pressurized with nitrogen (an inert gas) and leak checked. In order to determine the general area of a leak use an electronic or ultrasonic leak detector. (Page 21 ESCO EPA 9TH V2 Edition Prep Manual)
All comfort cooling systems containing more than 50 pounds of refrigerant must be repaired when the annual leak rate exceeds _____ .
Correct answer: 15%
For equipment that is not industrial or commercial, the threshold is 15%. For industrial and commerical equipment, the threshold is 35%.
If a leaking appliance with a regulated refrigerant can't be fixed, it must be:
Correct answer: retrofitted or retired within 12 months.
Type II appliances that will not be repaired must be retrofitted or retired in 12 months. If the appliance is using an exempt refrigerant then the owner has 18 months to retire the leaking system. (Page 20 ESCO EPA 9TH V2 Edition Prep Manual)
True or false: The receiver is not part of a refrigeration system's low side?
Correct answer: True
The receiver is placed in the liquid line, which is not part of the low side.
How often should leaks in commercial refrigeration equipment's recovery or recycling units be checked?
Correct answer: 3 Months
Commercial refrigeration equipment with a full charge of 500 or more pounds should have an inspection every 3 months. If they have between 50 and 500 pounds, the inspection can occur once per year. Comfort cooling appliances can have an inspection once every year as well.
The leak rate is based on a percentage of the total charge depending on the amount of refrigerant lost in the previous 12 months.
Correct answer: False
Repair requirements is the current leak rate projected over a consecutive 12-month period.
Except for commercial and industrial process refrigeration, EPA regulations mandate that any appliance containing more than 50 pounds of refrigerant be repaired if the leak rate ________ reaches of the charge per year.
Correct answer: 10 percent
EPA regulations require that any appliances containing more than 50 pounds of refrigerant, except for commercial and industrial process refrigeration, must be repaired when the leak-rate exceeds 10 percent of the charge per year.
THIS BECAME EFFECTIVE JANUARY 2019:For comfort cooling appliances with 50lbs or more, leak inspections must be conducted once per client per calendar year until such time your leak-rate calculations show that you have not exceeded the threshold limit of 10% for one year. In addition to this, after leak repairs on any of these appliances types you will need to conduct an initial test for verification as well as a follow-up. PREVIOUSLY the allowable leak rate was 15% for comfort cooling with 50lbs or more.
Heat pumps that use R-134a should be checked with ________ for leaks.
Correct answer: pressurized nitrogen
Heat pumps that use R-134a should be leak-checked with pressurized nitrogen
The refrigerant was recovered and stored in a refillable cylinder before replacing the condenser coil in a high-pressure system. This is the refrigerant.
Correct answer: can probably be charged back into the system.
Prior to replacing the condenser coil in a high pressure system, the refrigerant was covered and stored in a refillable cyclinder. The refrigerant can probably be charged back into the system.
Before switching to liquid charging on an R-410a system with a water-cooled condenser, you must first charge with vapor to a pressure of at least ________.
Correct answer: 120 psig
When charging an R-140a system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least 120 psig before switching to liquid charging.
What is the use of soap bubble testing?
Correct answer: to pintpoint leaks
Soap bubble testing is used to pinpoint refrigerant leaks.
When the leak rate exceeds ________ the charge per year, EPA regulations require that leaking commercial or industrial process refrigeration equipment be repaired.
Correct answer: 30% EPA Regulations requires the leaking commercial or industrial process refrigeration equipment must be repaired when the leak-rate exceeds 30% of the charge per year.NEW LEAK THRESHOLDS BECAME EFFECTIVE JANUARY 2019: Leak rates for commercial refrigeration now cannot exceed 20 percent and cannot exceed 30 percent for industrial process refrigeration. The previous were 30% for both commercial refrigeration and industrial process refrigeration.