Topics: ASHRAE/CMR
1: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Fusible plug
- Glove valve
- Rupture disk
2: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- there is no Group B1 refrigerants
- lower
- the same
3: Stop valves shall not be permitted between the system and the
- condenser
- service valve
- bleed valve
- relief valve
4: Relief valves are rated in
- pounds of air per minute
- gallons of water per minute
- pounds of air per hour
- gallons of water per hour
5: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 15
- 10
- 25
6: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
7: What pipe can not be used for refrigeration?
- N
- K
- M
- L
8: 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
- Nothing must be done
- You can't change lubricants.
9: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Copper
- Aluminum
- Magnesium alloy
10: Most CFC's are
- toxic
- inert but toxic
- flammable
- inert
11: Trichlorofluoromethane is the name of what refrigerant?
- R-12
- R-113
- R-502
- R-11
12: What must be done to refrigerant pipes before being buried?
- Encased
- Leaked checked
- Coated
- Certified
13: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
14: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
15: A class B2 refrigerant is considered
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
- toxic and non-flammable
16: What refrigerant doesn't have to be classifted?
- R-717
- R-711
- R-718
- R-134a
17: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 25' above grade
- At least 15' above grade
- At least 20' above grade
18: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
19: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 800F
- 1000F
- 700F
20: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 18
- 15
- 24
21: A class A3 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
22: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 330 lbs
- 500 lbs
23: Each machinery room shall contain
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- high and low pressure controls
- 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
24: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-22
- R-11
25: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above