Topics: All categories in the pool
1: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
2: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- higher
- lower
- the same
3: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
4: Copper and its alloys shall not be used with ammonia
- True
- False
5: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
- outlet of the liquid line
6: Heat is a form of
- energy
- work
- matter
- power
7: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
8: The low pressure oil safety switch
- must be reset manually
- resets itself after the time delay has terminated
- never trips
- resets itself automatically
9: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- black iron
- magnesium
10: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- low-ambient controller
- thermostat
11: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 90%
- 75%
- 99%
12: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
13: Ammonia vaporization takes place at what temperature?
- -460F
- -32F
- -28F
- -110F
14: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would have no effect on the condenser
- it would cause the condenser to sweat
- it would make the condenser less efficient
- it would make the condenser more efficient
15: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
16: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 60% Li-Br, 40% distilled water
- 50% Li-Br, 50% tap water
- 40% Li-Br, 60% tap water
- 40% Li-Br, 60% distilled water
17: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
18: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-11
- R-113
19: What device measures the specific gravity of a substance?
- Thermometer
- Manometer
- Hygrometer
- Hydrometer
20: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- 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 such that a leak of refrigerant from failed connections will enter the occupied space
21: Which refrigerant class listed below is the most flammable?
- C3
- B2
- A3
- A2
22: The reversing valve is commonly used
- when the code requires a check valve
- on multiple compressor systems
- on all heat pumps
- on commercial system that involve two different temperatures
23: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 36"
- 24"
- 18"
24: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
25: The proper location for an oil separator is between the
- receiver and metering device
- condenser and receiver
- compressor and condenser
- evaporator and compressor