Topics: ASHRAE/CMR
1: Name three things that must be done when changing refrigeration lubricant?
- Make sure it's compatible, notify owner, notify AHJ
- Place sign, check for leaks, insulate
- You can't change lubricants.
- Nothing must be done
2: A hotel is considered a _______ occupancy.
- commercial
- institutional
- mercantile
- residential
3: Which refrigerant class listed below is the most flammable?
- B2
- A2
- A3
- C3
4: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UM or UL
- UL and UM
5: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
6: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Magnesium
- Aluminum
- Zinc
7: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
8: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Rupture disk
- Gate valve
- Glove valve
9: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-22
- R-12
10: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- low limit control
- zone valve
- pressure relief device
11: 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, 2.5
- 3.0, 3.5
- 2.5, 3.0
- 6.6, 6.6
12: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Weight and color
- Flammability and toxicity
- Flammability and temperature range
13: A declaration test is needed when the system contains more than
- 55 lbs
- 65 lbs
- 110 lbs
- 120 lbs
14: 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
- welder qualified
- competent welder
- licensed welder
- licensed technician
15: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- Ceiling height
- 6'
- 7.25'
16: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
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: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 1
- 2.2
- 1.5
19: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 2
- 1
20: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- annually
- every 18 months
21: 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
22: What is not a requirement of a class T machine room?
- automatic ventilation
- self-closing doors
- fire hose connection to the building fire protection system
- tight fitting doors
23: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- compressor
- outside the machinery room
- boiler
- evaporator
24: How are refrigerant blends classified?
- Based on best case Fractionation
- Based on worst case fractionation
- Based on the oil used
- Blends don't have to be classified
25: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 6.6
- 330
- 110
- 1,000