Topics: ASHRAE/CMR
1: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
2: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
3: How many refrigerant classifications are there for toxicity?
- 3
- 5
- 1
- 2
4: How many different groups of refrigerants are there?
- 11
- 15
- 7
- 3
5: Halogen refrigerants are corrosive to which type of metal?
- black iron
- copper
- stainless steel
- magnesium
6: A positive displacement compressor is
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
7: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 50
- 55
- 15
- 75
8: What does safe access mean?
- OSHA approved
- Well-lit exit signs
- Locked doors
- A clear unobstructed path to the equipment and controls
9: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
- place sign, check for leaks, insulate
- you can't change refrigerants
10: What is a Category "M" fluid?
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- A typical refrigerant used on newer air conditioning and heat pump systems
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
11: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
12: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Stainless Steel
- Copper
- Aluminum
13: What type of material can't be used on the outlet of a relief valve?
- Copper
- Stainless steel
- PVC
- Magnesium alloy
14: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Copper
- Zinc
- Magnesium
15: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 15
- 20
- 50
- 75
16: A relief valve shall be located at least ___ above grade.
- 15'
- 25'
- 10'
- 36'
17: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-11
- R-22
18: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 55 lbs
- 120 lbs
19: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-113
- R-11
20: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
21: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 660 lbs
- 500 lbs
22: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
23: How many refrigerant classifications are there for flammability?
- 1
- 7
- 2
- 3
24: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- lower
- the same
- higher
25: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- annually
- bi-annually
- quarterly