Topics: ASHRAE/CMR
1: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 18
- 36
- 24
- 48
2: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
3: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
4: What type refrigerant is NOT ozone depleting?
- HCFC
- CFC
- HFC
- Halon
5: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
6: When must refrigeration system covered by the code be inspected?
- Annually
- Annually and when installed
- Not required
- Upon installation
7: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Classifed
- Insulated and installed in a pipe duct (Encased)
- Certified
8: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
9: Refrigerants shall be classified by
- color codes
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- toxicity and flammability
10: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- T&P device
- Circuit Breaker
- Temperature limiter device
- Relief valve
11: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Copper
- Stainless steel
- Magnesium alloy
12: What refrigerant were phased out in 2004?
- R-134a
- R-12
- R-22
- R-11
13: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 1,000
- 330
- 6.6
14: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UM” and “UV”
- “UV”
- “UL”
- “U” or “UM”
15: 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
16: What type of relief valve is used on a CO2 system?
- fusible plug
- gate valve
- glove disc
- rupture disc
17: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 800F
- 600F
- 1000F
18: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Magnesium
- Copper
- Nickel
- Zinc
19: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Uniforms, checks, and invoices.
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
20: How are refrigerant blends classified?
- Based on the oil used
- Based on worst case fractionation
- Based on best case Fractionation
- Blends don't have to be classified
21: What section of ASHRAE-15 governs pressure vessels?
- Section 9 ASHRAE-15 ASME VIII unfired
- OSHA
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
22: What is R-22?
- CCFCM
- Chlorofluoromethane
- HFC
- Chlorodifluoromethane
23: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- gas masks must be worn
- explosion precautions must be taken
- no flames shall be permitted
- the owner shall be informed
24: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
25: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber