ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • high limit control
  • low limit control
  • zone valve

2: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

3: What is the minimum height refrigeration piping should be placed against walls?

  • Ceiling height
  • 72"
  • 6'
  • 7.25'

4: 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.

  • 350
  • 50
  • 100
  • 550

5: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

6: 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 high side
  • 2.5 times the design pressure
  • the aggregate of the high side and low side
  • the low side

7: The color code of a tank of ammonia is

  • white
  • light green
  • silver
  • lavender

8: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall be inspected by the Boiler of Inspectors bi-annually
  • 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
  • does not require a pressure-limiting device

9: When a refrigeration or air conditioning system is installed

  • a field inspection shall be made before it is put into service
  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall not be operated below prescribed pressures
  • it shall be approved by the owner for proper operation.

10: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 75%
  • 80%
  • 90%
  • 100%

11: Most CFC's are

  • flammable
  • toxic
  • inert
  • inert but toxic

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

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

13: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

14: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • low side of the system
  • high side of the system
  • the vapor side of the system
  • the liquid side of the system

15: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • bi-annually
  • regularly
  • quarterly
  • annually

16: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

17: Ammonia (NH3) is a group III refrigerant

  • True
  • False

18: A restaurant is classified as a

  • public assembly occupancy
  • mixed occupancy
  • commercial occupancy
  • large mercantile occupancy

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

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

20: 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

21: Class T machine room

  • shall include closets used for setting equipment
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall have remote controls to stop the action of the refrigerant compressor
  • has no flame producing apparatus permanently installed

22: High pressure controls should be set no higher than

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

23: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

24: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 9.00'
  • 8'4"
  • 7.25'
  • 7.00'

25: What type of pressure relief device is used on a CO2 system?

  • Rupture disk
  • Fusible plug
  • Glove valve
  • Gate valve