ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: Ammonia can come in contact with _______ ?

  • Brass
  • Copper tubing
  • Copper
  • Aluminum

2: Doors communicating with outside from a mechanical room must be?

  • Self-closing, wooden, fire door
  • Self-closing, approved, fire door
  • Steel, approved, weather-stripped
  • Self-closing, aligned, fire door

3: R-410A is classified as a ____ refrigerant on the safety matrix.

  • B-2
  • A-2
  • A-1
  • B-1

4: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class T machinery room
  • Class B machinery room
  • Class M machinery room
  • Class A machinery room

5: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • a pressure relief device
  • a fusible plug
  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
  • either a fusible plug or a pressure relief device

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

  • shall have a pressure limiting device installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed
  • does not require a pressure-limiting device
  • shall be inspected by the Boiler of Inspectors bi-annually

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

  • True
  • False

8: Ammonia belongs to Group

  • A-1
  • B-2
  • B-1
  • A-2

9: Refrigerants shall be classified by

  • toxicity and flammability
  • maximum permissible quantities of each group
  • requirements for commercial, industrial, and residential occupancies
  • color codes

10: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

11: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 33
  • 50
  • 18
  • 22

12: 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

13: A Low-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 can not enter the occupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space

14: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

16: Stop valves shall not be permitted between the system and the

  • relief valve
  • service valve
  • bleed valve
  • condenser

17: Most CFC's are

  • toxic
  • inert but toxic
  • flammable
  • inert

18: How many different groups of refrigerants are there?

  • 7
  • 15
  • 3
  • 11

19: Liquid level gauges must be provided with what?

  • A relief valve
  • A low level mark
  • A red line
  • Automatic shut-offs

20: Joints in refrigeration piping must be _____ before being covered?

  • Leak tested
  • Insulated
  • Pressurized
  • Inspected

21: When should a relief valve start to function?

  • Before the purge station discharges
  • At it's set pressure
  • Two times it's working pressure
  • 10 psi before it's set pressure

22: What is an egress?

  • An escape route
  • An entrance or exit
  • A code violation
  • A valve put on the low side of the system to prevent frosting

23: What is a Category "M" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperatures over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content

24: What refrigerant doesn't have to be classified?

  • R-422A
  • R-718
  • R-134A
  • R-717

25: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 2
  • 3
  • 1
  • 5