Topics: ASHRAE/CMR
1: Refrigerants shall be classified by
- color codes
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- toxicity and flammability
2: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
3: What refrigerant doesn't have to be classifted?
- R-711
- R-717
- R-718
- R-134a
4: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
5: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 800F
- 600F
- 1000F
6: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 80%
- 90%
- 100%
7: What is the minimum height refrigeration piping should be placed against walls?
- 7.25'
- 72"
- 6'
- Ceiling height
8: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 50
- 550
- 100
- 350
9: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Copper
- Stainless steel
- Magnesium alloy
10: How many refrigerant classifications are there for flammability?
- 3
- 7
- 2
- 1
11: Ammonia belongs to Group
- A-2
- B-2
- A-1
- B-1
12: R-11 belongs to Group
- A-1
- B-3
- A-2
- B-1
13: Doors communicating with outside from a mechanical room must be?
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
14: What is R-22?
- CCFCM
- Chlorofluoromethane
- HFC
- Chlorodifluoromethane
15: 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
16: Evaporators within 18" of a heating coil must be equipped with a
- zone valve
- low limit control
- pressure relief device
- high limit control
17: 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
18: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
19: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- outside the machinery room
- compressor
- evaporator
20: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
21: 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
22: What is an example of institutional occupancy?
- Dorms
- Shopping mall
- Hospital
- Football stadium
23: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 100%
- 80%
- 75%
24: What section governs pressure vessels?
- Section ASHREA 34
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- OSHA
25: Pressure relief valves shall be marked with the data from
- Section XIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code