ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

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