Topics: ASHRAE/CMR
1: A restaurant is classified as a
- mixed occupancy
- public assembly occupancy
- large mercantile occupancy
- commercial occupancy
2: How many gallons of water do you need per pound of ammonia?
- 1
- 50
- 10
- 100
3: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
4: Which refrigerant class listed below is the most flammable?
- A-3
- B-2
- C-3
- A-1
5: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- lower
- higher
- there is no Group B1 refrigerants
6: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
7: Single compound Refrigerants are classified by what two criteria?
- Weight and color
- Flammability and temperature range
- Temperature range and hazardousness
- Flammability and toxicity
8: R-22 falls under which safety classification?
- B-1
- B-2
- A-2
- A-1
9: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- low limit control
- zone valve
- high limit control
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 660 lbs
- 55 lbs
11: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- critical pressure
- low pressure
- design pressure
12: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Self-closing doors
- Tight fitting doors
13: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 1/8"
- 1/16"
- 3/32"
14: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
15: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- 2.5 times the design pressure
- the aggregate of the high side and low side
- the high side
16: When should a relief valve start to function?
- Before the purge station discharges
- Two times it's working pressure
- At it's set pressure
- 10 psi before it's set pressure
17: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
18: 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
19: Ammonia is under what safety classification?
- B2
- B1
- B3
- A3
20: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
21: All electrical work done on refrigeration systems must comply with
- Department of Energy
- NEC and Massachusetts Modifications
- OSHA
- ASHREA-15 Section 9.2.1
22: NH3 is
- ammonia
- lithium bromide
- R-718
- R-508A
23: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
24: What refrigerant doesn't have to be classified?
- R-717
- R-422A
- R-718
- R-134A
25: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device