Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- B2
- A2
- A3
- C3
2: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 24
- 18
- 36
3: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
4: NH3 is
- R-508A
- lithium bromide
- R-718
- ammonia
5: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Upon installation
- Annually and when installed
6: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or more
7: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 13.9 lbs
- 44 lbs
- 6.6 lbs
8: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 25
- 66
9: Who is permitted to access a refrigeration machine room?
- Contractors only
- Any employee
- Anyone, it's a completely safe area
- Authorized persons only
10: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
11: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices
- shall use fusible plugs
12: A professional or office building would be considered what type of occupancy?
- mercantile
- business
- public assembly
- commercial
13: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
14: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Pressurized
- Leak tested
- Insulated
15: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
16: A High-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
17: The color code of a tank of ammonia is
- silver
- white
- light green
- lavender
18: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- yes
- no
- yes, for systems under 10 tons
19: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 50
- 22
- 18
20: High pressure controls should be set no higher than
- 90% of set point
- 80% of set point
- 10% of set point
- 25% of set point
21: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Moisture indicator
- Foot valve
- Muffler
- Stop valve
22: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-22
- R-12
23: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
24: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- higher
- there is no Group B1 refrigerants
- the same
- lower
25: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- phosgene gas sening
- refrigerant sensing
- A group sensing
- CO Sensing