EPA 608 Type III Practice Test
A rupture disk in a low-pressure system will open at which of the following psig?
Correct answer: 15 psig
A rupture disk breaks and releases pressure after exceeding a certain level. Pressure should not exceed 10 psig. Anything above 10 psig will result in a break and release of pressure.
With Type III certification, what kind of equipment can be worked on?
Correct answer: Low-pressure
Technicians maintaining, servicing, repairing or disposing of lowpressure appliances must be certified as a Type III Technician or a Universal Technician. (Page 24 ESCO EPA 9TH V2 Edition Prep Manual)
Which of the following is used to cool the absorption chiller?
Correct answer: Heat
A heat source like steam is used to regenerate the absorption solution.
What is the machine room safety standard:
Correct answer: ASHRAE-15
ASHRAE standard 15 requires a refrigerant monitor that will sound an alarm and automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the TLVTWA, (threshold limit valuetime weighted average). (Page 27 ESCO EPA 9TH V2 Edition Prep Manual)
All refrigerated recovery cylinders are approved by this agency:
Correct answer: DOT
The Department of Transportation (DOT) must approve all recovery cylinders.
When evacuating refrigerant, water must be circulated through the tubes to prevent:
Correct answer: Water from freezing.
Water must be circulated through the tubes when evacuating refrigerant in order to prevent freezing the water. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
Which of the following types of compressors are open-drive compressors?
Correct answer: Reciprocating
Open-drive compressors are typically reciprocating compressors. The motor is completely outside the body.
To repair an R-22 chiller, the technician must:
Correct answer: must have a Type II certification.
R-22 is a high-pressure refrigerant therefore type II certification is needed. R-11 and R-123 are low-pressure refrigerants. (Page 20 ESCO EPA 9TH V2 Edition Prep Manual)
Convert 5 tons of energy into BTUs every hour.
Correct answer: 60,000
One refrigeration ton is equal to 12,000 BTUs per hour.
What temperature must be attained while removing oil from a low-pressure system?
Correct answer: 130 degrees F.
A temperature of 130° F should be attained when removing oil from a lowpressure system. Less refrigerant is contained in the oil at this higher temperature. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
An electronic leak detector can detect leaks at what rate per year?
Correct answer: .25 oz
Electronic detectors are very sensitive and can detect leaks in the .25 oz per year range.
For recovery or recycling equipment used on low-pressure systems, the EPA required evacuation level is:
Correct answer: 25 mm of Hg absolute.
Recovery or recycling equipment manufactured or imported before or after Nov. 15, 1993, must be able to achieve a recovery level of 25mm Hg Absolute. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
What is the time period for repairing substantial leaks?
Correct answer: 30 Days
Leaks must be repaired within 30 days of finding the leak.
When charging a low-pressure system, introduce refrigerant as a vapor to raise the system's saturation temperature to a minimum of;
Correct answer: 36 degrees
Before charging with liquid, a refrigeration system requires a vapor pressure above a saturation temperature of 36° F. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
What percentage or more of the normal charge for industrial and commercial refrigeration systems is a substantial leak?
Correct answer: 35%
35% is the threshold. For equipment that is not commercial or industrial, the threshold is 15%.
Which of the following best defines the R-123 system's refrigerant recovery process?
Correct answer: Start with liquid removal and then switch over to vapor recovery.
Refrigerant recovery from a system using R11 or R123 starts with liquid removal and is followed by vapor recovery. (Page 25 ESCO EPA 9TH V2 Edition Prep Manual)
Which of the following gases is used in leak detection?
Correct answer: HCFC-22
HCFC-22 can detect much smaller leaks. The helium molecules are much smaller than the nitrogen molecules. This helps it better pick up leaks.
The sale of CFC and HCFC refrigerants was restricted to certified technicians on which of the following dates?
Correct answer: November 14th , 1994
November 14th, 1994 is the correct answer.
Is it possible for the refrigerant to escape from a low-pressure system?
Correct answer: No
The pressure in the refrigeration system is lower than the atmosphere so there is change outside air coming in to the refrigeration system.
Small chillers often use centrifugal or screw compressors that are semi-hermetic.
Correct answer: False
What is the impedance symbol?
Correct answer: Z
The symbol or letter for impedance is Z and it is represented by writing its magnitude and phase.
What exactly does a sling psychrometer measure?
Correct answer: Wet and dry bulb temperature
A sling psychrometer is a device that consist of two thermometers fitted in a hinged bracket used for spinning the two thermometers. One of the bulbs is kept moist with distilled water on a sock or wick placed over the thermometer's tip. As the thermometers are rotated, evaporation of water from the wick lowers the temperature indicating a lower temperature than that of the dry-bulb thermometer. This is the Wet bulb temperature which will be lower than the dry bulb and can never be above dry bulb measurement. The lower the relative humidity, the lower the wet bulb temperature. The difference in the two bulbs readings can be applied to a psychrometric chart to calculate relative humidity and other properties of air.
Between a heat pump and an air conditioner, what's the primary difference?
Correct answer: Reversing valve
The reversing valve is the component that will reverse the flow of refrigerant when changing from air conditioning to heating.
What device controls the extra electric heat based on the temperature outdoors?
Correct answer: Outdoor ambient thermostat
To control energy, the heat pump will incorporate outdoor thermostats to limit the auxiliary heat before the balance point is reached.
On an outdoor condensing unit, what is the minimum clearance for access panels?
Correct answer: 30 inches
The minimum clearance for access panels on an outdoor condensing unit is 30 inches.