Topics: ASHRAE/CMR
1: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a pressure relief device
2: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 800F
- 700F
- 600F
3: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
4: What kind of material can't be used on the outlet of a relief valve?
- Copper
- PVC
- Stainless Steel
- Aluminum
5: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
- Inspector leaves a metal tag with a certification listed on it
6: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the outdoors
- Machinery rooms need not be vented
- the return air ducted system
7: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
8: 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
- evaporator
- outside the machinery room
- boiler
9: A relief valve discharge capacity is rated in
- PSIG
- temperature minus pounds of air per second divided by release rate squared
- PSIA
- Pounds of air per minute.
10: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 15' above grade
- At least 20' above grade
- At least 25' above grade
11: Pipe identification labels are required when the system contains more than
- 65 lbs
- 120 lbs
- 55 lbs
- 110 lbs
12: R-11 belongs to Group
- B-3
- A-1
- B-1
- A-2
13: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- there is no Group B1 refrigerants
- higher
- the same
14: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
15: What pipe can not be used for refrigeration?
- M
- K
- N
- L
16: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 10
- III
- 25
17: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- you can't change refrigerants
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
18: How are refrigerant blends classified?
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
- Based on best case Fractionation
19: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 80%
- 100%
- 90%
20: The color code of a tank of ammonia is
- white
- lavender
- silver
- light green
21: 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.
22: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Zinc
- Magnesium
- Nickel
- Copper
23: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device installed on the high side of the system
24: Ammonia can come in contact with _______ ?
- Brass
- Copper tubing
- Aluminum
- Copper
25: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- A-2
- B-1