Topics: ASHRAE/CMR
1: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-113
- R-12
- R-11
2: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 90%
- 80%
- 100%
3: 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.
4: What is Trichlorotrifluoromethane?
- R-113
- R-13
- R-11
- R-12
5: What type refrigerant is NOT ozone depleting?
- CFC
- HFC
- HCFC
- Halon
6: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- There is no minimum for relief valve and windows.
- At least 40'
- At least 20'
7: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
8: Machinery rooms must be vented to ______?
- neutralizing tank
- outdoors
- basement
- unoccupied spaces
9: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
10: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection
- over pressure protection as well as a temperature protection device
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection and a rupture disc
11: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- installed through a pipe casing
- moisture barrier
- leak checked
12: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Certified
- Encased
13: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-22
- R-12
14: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the vapor side of the system
- the liquid side of the system
- high side of the system
15: 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
- 1,000
- 100,000
16: 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 welder
- competent welder
- welder qualified
- licensed technician
17: What is a Category "M" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
18: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- Stainless steel
- PVC
19: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 66
- 50
- 25
20: Class A refrigerants are considered
- non-toxic
- flammable
- non-flammable
- toxic
21: What type of relief valve is used on a CO2 system?
- fusible plug
- rupture disc
- glove disc
- gate valve
22: 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
23: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Muffler
- Moisture indicator
- Stop valve
- Foot valve
24: Halogen refrigerants are corrosive to which type of metal?
- black iron
- magnesium
- stainless steel
- copper
25: How much refrigerant can be stored in a mechanical room outside of the system?
- 330
- 150
- 200
- 100