Topics: ASHRAE/CMR
1: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
2: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UM or UL
- UL and UR
- UV or UR
- UL and UM
3: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- magnesium
- black iron
4: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- shall be prohibited
5: When should a relief valve start to function?
- 10 psi before it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- At it's set pressure
6: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Gate valve
- Glove valve
- Fusible plug
7: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
8: Class T machine room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
9: A professional or office building would be considered what type of occupancy?
- commercial
- business
- mercantile
- public assembly
10: What does safe access mean?
- OSHA approved
- Locked doors
- Well-lit exit signs
- A clear unobstructed path to the equipment and controls
11: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 330 lbs.
- 550 lbs
12: Ammonia belongs to Group
- B-1
- A-2
- B-2
- A-1
13: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
14: A class B1 refrigerant is considered
- toxic but non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
15: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
16: A restaurant is classified as a
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
- mixed occupancy
17: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 700F
- 800F
- 1000F
18: 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
19: High pressure controls should be set no higher than
- 90% of set point
- 25% of set point
- 10% of set point
- 80% of set point
20: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-22
- R-12
- R-113
22: The color code of a tank of ammonia is
- lavender
- light green
- silver
- white
23: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- higher
- lower
- the same
24: What refrigerant doesn't have to be classified?
- R-718
- R-422A
- R-134A
- R-717
25: Who is permitted to access a refrigeration machine room?
- Contractors only
- Authorized persons only
- Any employee
- Anyone, it's a completely safe area