Topics: ASHRAE/CMR
1: 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
2: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
3: 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.
4: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
5: Who is permitted to access a refrigeration machine room?
- Contractors only
- Any employee
- Anyone, it's a completely safe area
- Authorized persons only
6: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- higher
- lower
- the same
7: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the vapor side of the system
- low side of the system
- the liquid side of the system
- high side of the system
8: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Glove valve
- Rupture disk
- Gate valve
9: R-22 falls under which safety classification?
- B-1
- A-2
- A-1
- B-2
10: 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
11: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
12: What pipe can not be used for refrigeration?
- L
- M
- K
- N
13: The color code of a tank of ammonia is
- lavender
- silver
- white
- light green
14: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- phosgene gas sening
- A group sensing
- CO Sensing
15: What do you need to do when you install a new system?
- Have it inspected
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Add refrigerant
16: B3 refrigerants are considered
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic and highly flammable
17: What is Trichlorotrifluoromethane?
- R-13
- R-113
- R-12
- R-11
18: 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
19: What type refrigerant is NOT ozone depleting?
- HFC
- Halon
- CFC
- HCFC
20: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 10
- 15
- 25
- III
21: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- commercial occupancy
- public assembly occupancy
22: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 66
- 22
23: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- critical pressure
- high pressure
24: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
25: R-11 belongs to Group
- A-2
- A-1
- B-1
- B-3