Core
It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method, however it:
A - Often contains moisture
B - Requires a minimum of 10 PSIG
C - Is toxic when released into the atmosphere
D - requires a pressure regulator
D - Requires a pressure regulator
What is the state of the refrigerant leaving the receiver in the refrigeration system?
A - Low pressure liquid.
B - Low pressure vapor.
C - High pressure liquid.
D - High pressure vapor.
C - High Pressure liquid.
Which of the following is a very high pressure refrigerant on their EP A's refrigerant recycling regulations?
A - R-22
B - R-134a
C - R-13
D - R-500
D - R-500
How should refrigerant cylinders be positioned when they are shipped?
A - Inverted
B - Spaced apart
C - Upright
D - Horizontally
C - Upright
The Clean Air Act :
A - sets a schedule for the phase outs of CFC's HCC production.
B - Prohibits venting of refrigerants.
C - Authorizes the EPA to set standards for recovery of refrigerants
D - All of the above
D - All of the above
During evacuation with large amounts of moisture, it may be necessary to increase pressure to counteract freezing with gas such as.
A - R-410a
B - R-22
C - compressed air
D - Nitrogen
D - Nitrogen
According to ASHRAE's 1992 refrigerant safety classification, which notations would be the following designations would be the most safe:
A - A-1
B - A-3
C - B-1
D - B-3
A - A-1
Which of the following repairs would always be considered "major" under EPA's regulations?
A - Replacement of an evaporator coil.
B - Replacement of a filter dryer.
C - Replacement of a Schrader valve core.
D - Replacement of a condenser fan motor.
A - Replacement of an evaporator coil.
When a pungent odor is detected during a sealed system recover repair, which of the following is most likely?
A - A refrigerant should not be recovered
B - A compressor burnout has occurred
C - It is the characteristic smell of the refrigerant
D - The refrigerant should be vented
B - A compressor Burnout has occurred
What is a good characteristic of refrigerant oil that is hygroscopic?
A - it is a good lubricant
B - it is a crude oil and unrefined
C - it readily absorbs moisture
D 0- It can be left open to ambient air
C - it readily absorbs moisture
Which of the following indicates air in a low pressure system?
A - High Head Pressure
B - High liquid level
C - Low head Pressure
D - Low suction pressure
A - High Head pressure
A comfort cooling system that contains 50 pounds or more of R-410a is leaking. What will be the new maximum allowable annual leak rate starting in 2019.
A - 5 %
B - 10 %
C - 15 %
D - 20 %
B - 10 %
The primary water source for a recovery unit condensing coil is:
A - Chilled water
B - Condenser water
C - Local Municiple water supply
D - Deionized water
C - Local Municiple water supply
What is the date if the Montrel Protocol?
A - November 15, 1992
B - October 18, 1990
C - September 16, 1987
D September 26, 1986
C - September 16, 1987
What type of synthetic oils are commonly used in new HFC systems and for retrofitting HCFC equipment to HFC refrigerants?
A - Polyolester
B - Glycol
C - Alkylbenzene
D - Mineral Oil
A - Polyolester
When first inspecting a hermetic system known to be leaking, you should look for:
A - frost on the tubing
B - puddles of refrigerant
C - Particles of filter drier core
D - traces of oil
D - traces of oil
A recovery machine that uses a harmonic compressor will overheat when drawing a deep vacuum because:
A - It runs faster than other equipment
B - The motor needs the flow of the refrigerant through the compressor to provide motor cooling
C - The oils used in hermetic compressors burn at lower temperatures
D - It has a higher compression ratio limit than other equipment
B - The motor needs the flow of refrigerant through the compressor to provide motor cooling.
ASHREA Standard 15 - 2013 requires the use of room sensors and alarms to detect:
A - refrigerant leaks
B - high levels of ozone
C - refrigerant contamination
D - Phosgene gas
A - Refrigerant leaks
When using a recovery unit on a system containing 100 pounds of R410 a, it must be evacuated too:
A - 0 inches of mercury
B - 4 inches of mercury
C - 10 inches of mercury
D - 15 inches of mercury
A - 0 inches of mercury
Which of the following factors affect the speed of system dehydration.
A - The ambient temperature and the entropy of the refrigerant.
B - The ambient temperature and the amount of moisture in the system.
C - The Latent heat content of the refrigerant.
D - The Systems Superheat
B - The ambient temperature and the amount of moisture in the system.
After 1995, Any supplies of CFC refrigerant to service existing units in the USA can only come from:
A - recycling and recovering
B - Solvent conversion
C - Thirdworld chemical manufactures
D - Mrs. Jones
A - Recovery and recycling
Non-condensables will cause:
A - low superheat
B - low discharger pressure
C - high superheat
D - high discharge pressure
D - high discharge pressure
In which component of a system does the refrigerant change from a high pressure vapor to a high pressure liquid?
A - Receiver
B - Metering Device
C - Accumulator
D - Condenser
D - Condenser
The fastest way to recover refrigerant from a system is to remove it in a _____ phase?
A - Vapor
B - Final
C - Liquid
D - Solid
On low pressure chillers, moisture most frequently enters the refrigeration system through:
A - Air leaks in the ruptured disk assembly
B - Tube weeks in the evaporator
C - Leaks from areas with gaskets or fittings.
D - Leaks from charging service valve.
C - Leaks from areas with gaskets or fittings
What percentage leak rate does a commercial cooling appliance have?
A - 10 %
B - 15 %
C - 20 %
D - 30 %
C - 20 %
After refrigerant liquid has been recovered from the appliance, any remaining vapor is:
A - Purged into the atmosphere
B - Isolated in the appliance
C - Pumped into appliance receiver
D - Removed by the recovery system
D - Removed by the recovery system
It has been illegal to vent substances for CFC's and HCFC refrigerants since:
A - June1,1992
B - July 15,1993
C - November 1993
D - November 1995
D - November 1995
When dealing with small systems, how many different refrigerants may be recovered into the same cylinder?
A - only 2
B - only Azeotropic refrigerant
C - Only non-azeotropic refrigerants
D - Only 1
D - Only 1
A passive system dependent recovery device for small appliances"
A - Never needs The use of a pump compressor or heat to recover the refrigerant.
B - Must use a pressure relief device when recovering refrigerant.
C - Captures refrigerant in a non-pressurized container.
D - Can only be performed on a system with non-operating compressor.
C - Captures refrigerant in a non-pressurized container.
The back seating of a suction shutoff valve will close the:
A - Suction line and compressor port
B - Compressor and gauge port
C - Gauge
D - compressor port
C - Gauge port
Excessive running of a purge system on a low-pressure chiller generally indicates what condition?
A - Faulty air sensors
B - Leaking system
C - Ambient temperature is too high
D - Low purge unit efficiency
B - leaking system
A customer has an industrial process refrigeration system that contains 1000 pounds of R22, that has exceeded the acceptable leak repair threshold. How often is a customer required to perform a leak inspection?
A - Every month
B - Every 3 months
C - Every 6 months
D - Every 12 months
B - Every 3 months
Pressure relief valves must never be:
A - installed in series
B - installed in parallel
C - installed vertically
D - only there has be reports of a leak
A - installed in series
CFCs will no longer be manufactured or imported into the United States after:
A - 1994
B - 1995
C - 1996
D - 1997
B - 1995
Which of the following gasses is used as the baseline measurement for global warming potential?
A - Ammonia
B - CFC-12
C - Carbon Dioxide
D - Propane
C - Carbon Dioxide
Before beginning a refrigerant recovery procedure, it is always necessary to:
A - Allow the system to stabilize.
B - Determine the type of refrigerant in the system.
C - Move the system to an outdoor location
D - Disconnect the appliance from the power source
B - Determine the type of refrigerant in the system
When under a deep vacuum, the motor winding of a hermetic refrigerant compressor:
A - Will be damaged if energized
B - Must be kept warm to operate properly
C - Will be protected by its insulation if the compressor is.
D - Will overheat only if the crank case heater is energized
A - Will be damaged if energized
The standard for machine room safety is:
A - ASHREA-740
B - AHRI -700
B - SNAP-19
D - ASHREA-15
D - ASHREA-15
If a leaking appliance with a regulated refrigerant is not going to be repaired, it must be:
A - retrofitted or retired within 3 months
B - retrofitted or retired on 12 months
C - replaced within 3 months
D - replaced withing 12 months
B - retrofitted or retired in 12 months
During chiller evacuation, water is circulated too:
A - speed up recovery
B - prevent loss of refrigerant to the atmosphere
C - maintain constant refrigerant pressure
D - prevent freezing of water
D - prevent water from freezing
Recovery devices that were manufactured after November 15th 1993 and are used for recovery of refrigerant from small appliances must be capable of:
A - Recovering 90% of the refrigerant when the compressor is operating or achieving a 4 inch vacuum under the conditions of ARI 740-1993.
B - Recovering 80% of a refrigerant when the compressor is operating.
C - Recovering 95% of refrigerant charge when the compressor is operating or achieving a 4 inch vacuum under conditions of ARI 740-1993.
D - Recovering 85% of the refrigerant when the compressor is operating.
A - Recovering 90% of the refrigerant when the compressor is operating or achieving a 4 inch vacuum under the conditions of ARI 740-1993.
When using recovery unit, the fill level of the recovery tank can be controlled by:
A - a mechanical float switch
B - an electronic shut -off device
C - weight and a scale
D - all of the above
D - all of the above
The sale of CFC and HCFC refrigerants is:
A - banned.
B - limited to the equipment owners of commercial property.
C - allowed if the quantity is less than 5 lbs.
D - restricted to technicians who are EPA certified in refrigerant recovery
D - restricted to technicians who are EPA certified in refrigerant recovery
The proper charging method for blended, non-azeotropic refrigerants (400 series) is to use a remove the charge from the cylinder as a:
A - vapor
B - liquid
C - heated
D - doesnt matter
B - liquid
A type 3 appliance with a system charge of 1000 lbs. of high-pressure refrigerant. What? is the percentage leak rate allowed:
A - 0 %
B - 10 %
C - 15 %
D - 30%
D - 30 %
A Chiller with a charge of 200 Lbs. of an ozone depleting refrigerant has passed the initial verification leak test. When must they follow up verification test be conducted?
A - 24 hours
B - 30 days
C - 7 days
D - 10 days
D - 10 days
How many microns need to be met on a used system, as per EPA requirements?
A - 1,000
B - 2,500
C - 500
D 100,000
C - 500
What was the last date of production of R-22?
A - January 1, 2019
B - December 31, 2020
C - January 1, 2020
D - December 31, 2019
D - December 31, 2019