Topics: ASHRAE/CMR
1: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
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: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
4: When should a relief valve start to function?
- Two times it's working pressure
- Before the purge station discharges
- 10 psi before it's set pressure
- At it's set pressure
5: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
6: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
7: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- high pressure
- critical pressure
- design pressure
8: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 10,000
- 100
- 100,000
9: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 15'
- 20'
- 25'
10: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
11: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
12: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
13: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 75%
- 99%
- 90%
14: 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
- the owner shall be informed
- no flames shall be permitted
15: A declaration test is needed when the system contains more than
- 120 lbs
- 55 lbs
- 65 lbs
- 110 lbs
16: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- quarterly
- annually
- bi-annually
- regularly
17: When an inspection is needed, how often must it be done?
- annually
- every 18 months
- every 24 months
- every 36 months
18: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- of Group B2 refrigerant shall be prohibited
- shall be prohibited
19: High pressure controls should be set no higher than
- 90% of set point
- 80% of set point
- 25% of set point
- 10% of set point
20: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- A field inspection shall be made before it is put into service
21: What type of relief valve is used on a CO2 system?
- glove disc
- rupture disc
- gate valve
- fusible plug
22: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak from a failed connection or component of such system
23: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- Aluminum
- Copper
- PVC
24: Who authorizes the form of certificate of completion of refrigeration systems that should be used?
- Supervisor or project manager in charge of the installation
- Fire Marshal
- Massachusetts Board of Boiler Rules
- Owner
25: Refrigerants shall be classified by
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- color codes
- toxicity and flammability