Topics: ASHRAE/CMR
1: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
2: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Muffler
- Moisture indicator
- Stop valve
3: Which refrigerant class listed below is the most flammable?
- C3
- A3
- B2
- A2
4: A restaurant is classified as a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
5: R-717 is
- water
- ammonia
- carbon dioxide
- trichloromethane
6: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 50
- 100
- 550
- 350
7: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- A group sensing
- CO Sensing
- phosgene gas sening
8: Ammonia (NH3) is a group III refrigerant
- True
- False
9: What is an egress?
- An entrance or exit
- An escape route
- A valve put on the low side of the system to prevent frosting
- A code violation
10: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
11: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
12: _____ and its alloys are suitable for use with ammonia systems.
- Aluminum
- Copper
- Magnesium
- Zinc
13: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
14: A relief valve shall be located at least ___ above grade.
- 15'
- 25'
- 36'
- 10'
15: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-11
- R-113
16: What refrigerant is an inorganic compound?
- Ammonia
- R-410A
- R-132A
- R-22
17: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- of Group B2 refrigerant shall be prohibited
18: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Inspected
- Insulated
- Leak tested
19: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 2.5, 3.0
- 3.0, 3.5
- 6.6, 6.6
- 2.5, 2.5
20: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 2
- 3
- 5
21: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- condenser
- service valve
22: What is a Category "D" fluid?
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- 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
23: Which refrigerant class listed below is the most flammable?
- A-1
- C-3
- B-2
- A-3
24: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
25: High pressure controls should be set no higher than
- 80% of set point
- 90% of set point
- 25% of set point
- 10% of set point