Topics: ASHRAE/CMR
1: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
- Approved by the authorized person
- Approved by the installing contractor
2: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 10,000
- 100,000
- 1,000
- 100
3: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
4: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
5: R-11 belongs to Group
- B-3
- B-1
- A-2
- A-1
6: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 330 lbs.
- 550 lbs
7: A pressure relief should be located at least _______ from windows and doors.
- 20'
- 30'
- 25'
- 15'
8: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
9: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
10: Ammonia can come in contact with _______ ?
- Aluminum
- Copper tubing
- Brass
- Copper
11: The Board of Boilers adopts by reference
- MSCA Code
- the MACS Pressure Vessel Code of Massachusetts
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code
12: What must be done to refrigerant pipes before being buried?
- Encased
- Certified
- Leaked checked
- Coated
13: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
14: Ammonia is under what safety classification?
- B3
- A3
- B2
- B1
15: What would be the classification of a church?
- Large mercantile
- Industrial
- Place of assembly
- Institutional
16: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
17: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 99%
- 75%
- 90%
18: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with ammonia
- Flush with R-718
- Flush with RX-11
- Flush with R-11
19: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
20: Which occupancy can ammonia be used in?
- redifential
- industrial
- commercial
- depends on the quantity of freon
21: NH3 is
- lithium bromide
- R-718
- ammonia
- R-508A
22: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class M machinery room
- Class T machinery room
- Class A machinery room
- Class B machinery room
23: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
24: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- design pressure
- high pressure
- low pressure
25: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 5/16"
- 3/32"
- 1/8"