Topics: All categories in the pool
1: Secondary refrigerants are usually
- expensive
- Prestone anti-freeze
- water or brine
- alcohol
2: What refrigerant were phased out in 2004?
- R-11
- R-22
- R-12
- R-134a
3: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
- When its white
4: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusion plug
- rupture plug
- fusible plug
5: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is a system highly likely to leak from a failed connection or component of such system
6: Total heat of a substance is considered
- sensible heat
- specific heat
- empathetical
- enthalpy
7: Capacitors are rated in
- megaohms
- volt - amperes
- kelvins
- micro-farads
8: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
9: A declaration test is needed when the system contains more than
- 120 lbs
- 55 lbs
- 65 lbs
- 110 lbs
10: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 330 lbs.
- 660 lbs
- 55 lbs
11: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the suction line
- traps are needed on the oil return line
- traps are needed on the discharge line
12: Which refrigerant replaced R-12?
- R-134A
- R-407A
- R-410A
- R-22
13: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
14: What device should be used on low-temperature freezers?
- high capacity TXV
- oil separator
- discharge muffler
- hot-gas by-pass
15: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-12
- R-22
16: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 50% Li-Br, 50% tap water
- 40% Li-Br, 60% distilled water
- 40% Li-Br, 60% tap water
- 60% Li-Br, 40% distilled water
17: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Fusible plug
- Gate valve
- Rupture disk
18: The actual expansion curve of compression follows most nearly which one of the following curves?
- Adiabatic
- Pressure Temperature
- Volume Temperature
- Isothermal
19: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
20: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 60
- 720,000
- 12,000
21: How many flammability classifications are refrigerants in?
- 3
- 5
- 7
- 2
22: Who is permitted to access a refrigeration machine room?
- Anyone, it's a completely safe area
- Contractors only
- Any employee
- Authorized persons only
23: On cooling towers, what causes the condenser water to drop
- tower fans
- ambient temperatures
- evaporation of the water droplets
- sensible heat
24: How are refrigerant blends classified?
- Based on worst case fractionation
- Based on best case Fractionation
- Blends don't have to be classified
- Based on the oil used
25: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-22
- R-11