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: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- high pressure
- critical pressure
3: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- OSHA
- Department of Energy
- NEC and Massachusetts Modifications
4: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
5: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 90%
- 75%
- 80%
- 99%
6: What type of relief valve is used on a CO2 system?
- rupture disc
- fusible plug
- gate valve
- glove disc
7: How many gallons of water do you need per pound of ammonia?
- 10
- 1
- 100
- 50
8: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
9: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Insulated and installed in a pipe duct (Encased)
- Certified
- Leak checked
- Classifed
10: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
11: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 55
- 15
- 50
12: Each machinery room shall contain
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
13: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
14: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
15: A class B1 refrigerant is considered
- toxic but non-flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
16: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Insulated and cross broke
- Ducted and sealed
- Welded and seamed.
17: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
18: What refrigerant is an inorganic compound?
- R-410A
- Ammonia
- R-132A
- R-22
19: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and toxicity
- Weight and color
- Flammability and temperature range
20: When must refrigeration system covered by the code be inspected?
- Not required
- Annually and when installed
- Annually
- Upon installation
21: R-22 falls under which safety classification?
- A-1
- A-2
- B-2
- B-1
22: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- first disconnect in
- load-side of the contactor in
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
23: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
24: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
25: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a fusible plug