Topics: All categories in the pool
1: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
2: B3 refrigerants are considered
- toxic and highly flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
3: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- between the compressor and the stop valve
- between the compressor and reciever
- on top of the condensor
4: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 12,000 BTU
- 144 BTU
- 24,000 BTU
5: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
6: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
7: While water is evaporated in an evaporative condenser the impurities which were in the water are
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
- remain in the air
- accumulate in the sump water
8: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Add refrigerant
- Have it inspected
- Insulate the suction line before you take a superheat reading
9: What is a Category "D" fluid?
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
10: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
11: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
12: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
13: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
14: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UL and UM
- UL and UR
- UM or UL
15: R-12 is
- trichlorofluoromethane
- dichlorodifluoromethane
- dichloromethane
- dichlorofluoromethane
16: R-717 is
- carbon dioxide
- water
- trichloromethane
- ammonia
17: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Water and soap
- Oil and water
- Moisture and air
- Air and dirt
18: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
19: What refrigerant doesn't have to be classifted?
- R-134a
- R-718
- R-717
- R-711
20: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
21: A capacitor in series with the start windings will do what?
- Increase starting torque
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
22: Who is permitted to access a refrigeration machine room?
- Contractors only
- Authorized persons only
- Anyone, it's a completely safe area
- Any employee
23: Ammonia systems use ____ pressure to adjust oil pressure
- discharge
- stream
- air
- liquid
24: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
25: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100,000
- 100
- 1,000
- 10,000