Topics: ASHRAE/CMR
1: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
2: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
3: What is R-22?
- Chlorofluoromethane
- HFC
- CCFCM
- Chlorodifluoromethane
4: Who approves containers for refrigerants?
- D.O.E
- D.O.D
- E.P.A
- D.O.T
5: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
- Ducted and sealed
6: Ammonia is under what safety classification?
- B2
- A3
- B1
- B3
7: The color code of a tank of ammonia is
- silver
- white
- light green
- lavender
8: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures
- the form of certificate shall be authorized by the Department of Pubic safety
9: 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
- licensed technician
- competent welder
- welder qualified
- licensed welder
10: High pressure controls should be set no higher than
- 10% of set point
- 80% of set point
- 90% of set point
- 25% of set point
11: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
12: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
13: 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
14: What is a Category "D" fluid?
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
15: Indirect systems using Group II refrigerants
- shall be used in refrigeration system less than 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
16: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
17: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- 10
- III
18: What would be the classification for Stop & Shop grocery store?
- Place of assembly
- Large mercantile
- Industrial
- Instituional
19: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
20: What type of relief valve is used on a CO2 system?
- fusible plug
- rupture disc
- glove disc
- gate valve
21: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UL and UM
- UL and UR
- UM or UL
22: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 2.5, 2.5
- 2.5, 3.0
- 3.0, 3.5
- 6.6, 6.6
23: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
24: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
25: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on worst case fractionation
- Based on best case Fractionation
- Based on the oil used