Topics: ASHRAE/CMR
1: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When its white
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
2: Joints in refrigeration piping must be _____ before being covered?
- Insulated
- Inspected
- Leak tested
- Pressurized
3: How much refrigerant can be stored in a mechanical room outside of the system?
- 330
- 200
- 150
- 100
4: What pipe can not be used for refrigeration?
- L
- M
- N
- K
5: What is not a requirement of a Class T machine room?
- Automatic ventilation
- Tight fitting doors
- Fire hose connected to the building fire protection system.
- Self-closing doors
6: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
7: Large mercantile occupancy is
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
8: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
9: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.5
- 1
- 2.2
- 1.2
10: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Aluminum
- Copper
- Magnesium
11: 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.
- 50
- 100
- 350
- 550
12: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Glove valve
- Gate valve
- Rupture disk
13: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 6.6
- 330
- 1,000
14: Refrigerants shall be classified by
- color codes
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
15: Pipe identification labels are required when the system contains more than
- 110 lbs
- 55 lbs
- 120 lbs
- 65 lbs
16: A restaurant is classified as a
- public assembly occupancy
- commercial occupancy
- large mercantile occupancy
- mixed occupancy
17: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-22
- R-123
- R-12
18: What is a Category "M" fluid?
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- 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
- A typical refrigerant used on newer air conditioning and heat pump systems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
19: Doors communicating with outside from a mechanical room must be?
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
20: When a refrigeration or air conditioning system is installed
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures
- 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
21: Trichlorofluoromethane is the name of what refrigerant?
- R-12
- R-11
- R-502
- R-113
22: A Low-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- 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
23: Halogenated refrigerants cannot be used with what material?
- Copper
- Magnesium alloy
- Stainless steel
- Aluminum
24: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
25: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- HCFC-123
- Lithium bromide
- CFC-11
- ammonia