ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's water
  • Because it's a non-flammable refrigerant
  • Because it's cheap

2: What is not a requirement of a class T machine room?

  • fire hose connection to the building fire protection system
  • tight fitting doors
  • self-closing doors
  • automatic ventilation

3: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.

  • True
  • False

4: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

5: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

6: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

7: A High-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space

8: B3 refrigerants are considered

  • non-toxic but flammable
  • toxic and highly flammable
  • toxic but non-flammable
  • non-toxic but non-flammable

9: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • you can never change refrigerants
  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.

10: 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
  • of Group B2 refrigerant shall be prohibited
  • shall not be prohibited

11: Can ammonia be used on domestic system?

  • no, unless there is proper ventilation system installed
  • no
  • yes, for systems under 10 tons
  • yes

12: Name three things that must be done when changing refrigeration lubricant?

  • Place sign, check for leaks, insulate
  • You can't change lubricants.
  • Nothing must be done
  • Make sure it's compatible, notify owner, notify AHJ

13: R-22 falls under which safety classification?

  • B-2
  • A-1
  • B-1
  • A-2

14: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • on a conspicuous card located near the evaporator
  • on a conspicuous card located near the compressor
  • outside the room, immediately adjacent to each door
  • inside the room, immediately adjacent to each door

15: What refrigerant were phased out in 2004?

  • R-134a
  • R-11
  • R-12
  • R-22

16: What type of copper is not permitted on refrigeration systems?

  • Type N
  • Type M
  • Type K
  • Type L

17: Single compound Refrigerants are classified by what two criteria?

  • Flammability and toxicity
  • Flammability and temperature range
  • Temperature range and hazardousness
  • Weight and color

18: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

19: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 30'
  • 15'
  • 20'

20: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Muffler
  • Foot valve
  • Moisture indicator

21: What type of relief valve is used on a CO2 system?

  • glove disc
  • gate valve
  • fusible plug
  • rupture disc

22: R-123 belongs to Group

  • B-3
  • B-1
  • B-2
  • A-3

23: How many gallons of water per pound of ammonia do you need?

  • 15
  • 20
  • 1
  • 5

24: High pressure controls should be set no higher than

  • 90% of set point
  • 10% of set point
  • 25% of set point
  • 80% of set point

25: Where a refrigeration or air conditioning system is installed,

  • A field inspection shall be made before it is put into service
  • it shall not be operated below prescribed pressuers
  • the form or certificate shall be authorized by the Department of Public Safety
  • The company who installed the system must notify the fire department in the jurisdiction where installed