Topics: All categories in the pool
1: The solution that leaves the concentrator in an absorption chiller is referred to as the
- strong solution
- weak solution
- absorbed solution
- diluted solution
2: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
3: A class B2 refrigerant is considered
- non-toxic and highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic and non-flammable
4: What is the state of the refrigerant leaving the evaporator?
- a high temperature subcooled liquid
- a high temperature superheated vapor
- low temperature superheated vapor
- a low temperature subcooled liquid
5: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 70.8 psig
- 66.1 psig
- 43.3 psig
6: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- high pressure
- critical pressure
- design pressure
7: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Certified
- Insulated and installed in a pipe duct (Encased)
- Leak checked
- Classifed
8: What is Trichlorotrifluoromethane?
- R-12
- R-13
- R-113
- R-11
9: The actual expansion curve of compression follows most nearly which one of the following curves?
- Adiabatic
- Pressure Temperature
- Isothermal
- Volume Temperature
10: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
11: Where is an EPR valve located on a multi-evaporator system?
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
12: Liquid line filter-driers on a 410A system must be rated for no less than
- 200 psig
- 1000 psig
- 600 psig
- 400 psig
13: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 15
- 10
- 24
- 18
14: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
15: Clearance volume
- affects compressor capacity
- varies depending on compressor speed
- is the same on all compressors
- has no effect on compressor capacity
16: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- red
- orange
- blue
17: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
18: A run capacitor is wired in series with the _____ windings.
- common
- start
- run
- start capacitor
19: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 257 psig, 77 psig
- 455 psig, 185 psig
- 226 psig, 68 psig
- 350 psig, 120 psig
20: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- the gas returns to a liquid
21: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
- Yes, always
22: In an ammonia refrigerating system, how is oil pressure adjusted?
- Outlet of pump
- Inlet of pump
- Spring tension of a pressure regulating valve
- Both a & b are correct
23: What does an anemometer measure?
- voltage
- amperage
- velocity
- temperature
24: Which of the following is not an air velocity meter?
- Anemotherm
- Anemometer
- Velometer
- Hydrometer
25: If the spring is adjusted to increase the superheat, this new setting will
- shorten the frost line
- have no effect on the frost line
- allow more liquid into the evaporator
- lengthen the frost line