Topics: ASHRAE/CMR
1: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
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
- 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
- A typical refrigerant used on newer air conditioning and heat pump ssytems
3: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 10
- 20
- 15
- 25
4: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 5/16"
- 3/32"
- 1/8"
5: All electrical work done on refrigeration systems must comply with
- OSHA
- ASHREA-15 Section 9.2.1
- NEC and Massachusetts Modifications
- Department of Energy
6: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-22
- R-134A
- R-11
7: A relief valve shall be located at least ___ above grade.
- 10'
- 25'
- 15'
- 36'
8: Each machinery room shall contain
- 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
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
9: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-134A
- R-410A
10: A relief valve discharge capacity is rated in
- PSIG
- PSIA
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
11: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and reciever
- between the compressor and oil separator
- between the compressor and the stop valve
12: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-11
- R-113
- R-12
13: 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
14: Stop valves shall not be permitted between the system and the
- bleed valve
- condenser
- service valve
- relief valve
15: When must refrigeration system covered by the code be inspected?
- Upon installation
- Not required
- Annually and when installed
- Annually
16: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
17: Ammonia can come in contact with _______ ?
- Copper tubing
- Brass
- Aluminum
- Copper
18: Can ammonia be used on domestic system?
- yes
- no, unless there is proper ventilation system installed
- no
- yes, for systems under 10 tons
19: When should a relief valve start to function?
- Before the purge station discharges
- Two times it's working pressure
- At it's set pressure
- 10 psi before it's set pressure
20: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-12
- R-22
21: What kind of material can't be used on the outlet of a relief valve?
- Copper
- Stainless Steel
- Aluminum
- PVC
22: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 36"
- 18"
- 12"
23: What refrigerant were phased out in 2004?
- R-134a
- R-11
- R-12
- R-22
24: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
25: R-22 is considered a(n)
- HCFCH
- HCFC
- CFC
- HFC