Topics: ASHRAE/CMR
1: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
2: What is the refrigerant chlorodifluoromethane?
- R-12
- R-22
- R-123
- R-134a
3: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 33
- 50
4: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- B-1
- A-2
- A-1
5: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
6: A declaration test is needed when the system contains more than
- 120 lbs
- 55 lbs
- 110 lbs
- 65 lbs
7: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
8: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- Department of Energy
- OSHA
- NEC and Massachusetts Modifications
9: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
10: Class A refrigerants are considered
- non-toxic
- toxic
- flammable
- non-flammable
11: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the vapor side of the system
- high side of the system
- the liquid side of the system
- low side of the system
12: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 20' above grade
13: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
14: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Insulated and installed in a pipe duct (Encased)
- Certified
- Classifed
- Leak checked
15: What is Trichlorotrifluoromethane?
- R-11
- R-13
- R-113
- R-12
16: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
- safe access
- service manuals
17: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 80%
- 75%
- 90%
18: What does safe access mean?
- Locked doors
- A clear unobstructed path to the equipment and controls
- OSHA approved
- Well-lit exit signs
19: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- bi-annually
- regularly
- quarterly
20: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's water
21: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
22: When must refrigeration system covered by the code be inspected?
- Upon installation
- Not required
- Annually
- Annually and when installed
23: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 3.0
- 2.0
- 5.5
24: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- welder qualified
- licensed technician
- competent welder
- licensed welder
25: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-113
- R-12
- R-22