Topics: ASHRAE/CMR
1: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
2: Which refrigerant class listed below is the most flammable?
- B-2
- A-3
- A-1
- C-3
3: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
4: What type of copper is not permitted on refrigeration systems?
- Type L
- Type M
- Type N
- Type K
5: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- zone valve
- high limit control
- low limit control
6: Doors communicating with outside from a mechanical room must be?
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
7: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 20
- 15
- 50
- 75
8: 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, 3.0
- 3.0, 3.5
- 2.5, 2.5
- 6.6, 6.6
9: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
10: Most CFC's are
- toxic
- inert but toxic
- flammable
- inert
11: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- T&P device
- Relief valve
- Temperature limiter device
- Circuit Breaker
12: Class A refrigerants are considered
- flammable
- non-flammable
- toxic
- non-toxic
13: When an inspection is needed, how often must it be done?
- every 36 months
- every 18 months
- annually
- every 24 months
14: R-22 is considered a(n)
- HFC
- HCFC
- CFC
- HCFCH
15: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- public assembly occupancy
- institutional occupancy
- illegal occupancy
- commercial occupancy
16: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 80%
- 90%
- 100%
- 75%
17: 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.
18: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 600F
- 800F
- 1000F
19: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 2.5
- 3.0
- 5.5
20: 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
- 100,000
- 100
- 1,000
21: How many different groups of refrigerants are there?
- 11
- 3
- 15
- 7
22: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- black iron
- copper
- magnesium
23: What refrigerant were phased out in 2004?
- R-11
- R-12
- R-22
- R-134a
24: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
25: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- .5 CFM
- 20 CFM
- 5 CFM