Topics: ASHRAE/CMR
1: B3 refrigerants are considered
- toxic and highly flammable
- non-toxic but flammable
- toxic but non-flammable
- non-toxic but non-flammable
2: Ammonia (NH3) is a group III refrigerant
- True
- False
3: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- critical pressure
- design pressure
- low pressure
4: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- low limit control
- zone valve
- pressure relief device
5: All serviceable components of a refrigeration system shall be provided with
- safe access
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- service manuals
- manufactures instructions on start-up procedures
6: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
7: What is the refrigerant chlorodifluoromethane?
- R-123
- R-12
- R-134a
- R-22
8: What is R-22?
- CCFCM
- HFC
- Chlorodifluoromethane
- Chlorofluoromethane
9: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
10: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
11: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
12: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
13: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
14: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Insulated
- Inspected
- Pressurized
15: How many refrigerant classifications are there for flammability?
- 7
- 3
- 1
- 2
16: High pressure controls should be set no higher than
- 80% of set point
- 25% of set point
- 10% of set point
- 90% of set point
17: Ammonia can come in contact with _______ ?
- Copper
- Copper tubing
- Brass
- Aluminum
18: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-11
- R-12
- R-113
19: What refrigerant is an inorganic compound?
- R-132A
- R-22
- Ammonia
- R-410A
20: Ammonia is under what safety classification?
- B2
- B3
- A3
- B1
21: 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
- load-side of the contactor in
- breaker panel in
- first disconnect in
- 24 volt secondary side of the Class 2 transformer to the thermostat
22: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When it's used as part of a supply or return air system
- When there are sprinklers above
- When there is a space 6' or more above it
23: 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
24: 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
25: What refrigerant were phased out in 2004?
- R-11
- R-22
- R-12
- R-134a