Topics: ASHRAE/CMR
1: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 50
- 33
2: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
3: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
4: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 1,000
- 6.6
- 110
5: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Rupture disk
- Fusible plug
- Gate valve
6: 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
7: Can you use Ammonia in industrial applications?
- Yes, always
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
8: When an inspection is needed, how often must it be done?
- every 24 months
- every 18 months
- annually
- every 36 months
9: What is the refrigerant chlorodifluoromethane?
- R-22
- R-134a
- R-12
- R-123
10: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 90%
- 100%
- 80%
11: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 8'4"
- 9.00'
- 7.00'
- 7.25'
12: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
13: What type of material can't be used on the outlet of a relief valve?
- PVC
- Copper
- Magnesium alloy
- Stainless steel
14: What refrigerant doesn't have to be classifted?
- R-717
- R-134a
- R-718
- R-711
15: Class 3 refrigerants are
- toxic
- non-toxic
- highly flammable
- non-flammable
16: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with ammonia
- Flush with R-718
- Flush with RX-11
- Flush with R-11
17: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy
18: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the return air ducted system
- Machinery rooms need not be vented
- the outdoors
19: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's cheap
- Because it's a non-flammable refrigerant
- Because it's water
- R-718 is not rated unlimited because it's a dangerous refrigerant
20: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 36
- 48
- 18
21: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
22: Which refrigerant class listed below is the most flammable?
- B-2
- A-3
- C-3
- A-1
23: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- OSHA
- Department of Energy
24: Ammonia belongs to Group
- A-2
- B-2
- B-1
- A-1
25: What kind of material can't be used on the outlet of a relief valve?
- Copper
- PVC
- Aluminum
- Stainless Steel