Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- C3
- A3
- B2
- A2
2: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- business occupancy
- commercial occupancy
- public assembly occupancy.
3: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-2
- A-1
4: Single compound Refrigerants are classified by what two criteria?
- Temperature range and hazardousness
- Flammability and toxicity
- Weight and color
- Flammability and temperature range
5: What refrigerant doesn't have to be classified?
- R-134A
- R-718
- R-422A
- R-717
6: Indirect systems using Group II refrigerants
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used in refrigeration system less than 1,000 lbs
- shall be used for mechanical equipment only
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
7: 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"
- 7.25'
- 7.00'
- 9.00'
8: Trichlorofluoromethane is the name of what refrigerant?
- R-12
- R-113
- R-11
- R-502
9: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
10: 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
11: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
12: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
13: What is an egress?
- A code violation
- An escape route
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
14: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
- When its white
15: What is an example of institutional occupancy?
- Football stadium
- Shopping mall
- Dorms
- Hospital
16: What is a Category "D" fluid?
- 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
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
17: Which refrigerant replaced R-12?
- R-410A
- R-22
- R-134A
- R-407A
18: 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
19: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- T&P device
- Relief valve
- Temperature limiter device
- Circuit Breaker
20: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Approved by the installing contractor
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
21: How many gallons of water per pound of ammonia do you need?
- 15
- 5
- 20
- 1
22: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- competent welder
- licensed technician
- licensed welder
- welder qualified
23: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- nothing must be done
- you can't change refrigerants
- make sure it's compatible, notify owner, notify A.H.J
- place sign, check for leaks, insulate
24: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Muffler
- Stop valve
- Foot valve
- Moisture indicator
25: Halogen refrigerants are corrosive to which type of metal?
- magnesium
- black iron
- copper
- stainless steel