Topics: All categories in the pool
1: What is a Category "M" fluid?
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
- 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
2: If the power element on an expansion valve should lose its charge, the valve would
- Over feed
- Stay open
- Close
- Under feed
3: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 96
- 38
- 88
- 58
4: How many gallons of water do you need per pound of ammonia?
- 10
- 50
- 100
- 1
5: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- moisture in the system
- not enough oil in the system
- low head pressure
- oil in evaporator
6: 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
7: A start capacitor is wired in _____ with the start windings.
- junction
- series
- series-parallel
- parallel
8: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 30F to 50F
- -40F to 0F
- 0F-38F
- -100F to -40F
9: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 75%
- 80%
- 90%
10: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
11: A relief valve shall be located at least ___ above grade.
- 15'
- 10'
- 25'
- 36'
12: A halide torch is most useful with a freon compression system
- to sweat flanges on the refrigeration piping
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
- to release a sticking valve
13: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
14: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 330 lbs
- 500 lbs
- 660 lbs
15: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- adjustment of the spring tension of the TXV
- opening at the pump inlet
- cooling temperature set-point
- opening at the pump outlet
16: When an electronic bridge is in balance the bridge output will be
- .01 volts
- 1 volt
- 0 volts
- 15 volts
17: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
18: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
19: Thermodynamics is the branch of science that deals with
- state of energy
- heat energy
- energy due to motion
- molecular therory
20: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 2.2
- 1.5
- 1
21: When the compressor is below the condensor
- traps are needed on the suction line
- traps are needed on the oil return line
- traps are needed on the discharge line
- traps are not needed on this type of system
22: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- weak solution
- absorbed solution
- concentrated solution
- strong solution
23: 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
24: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
25: A Lithium-bromide system is an absorption system that
- uses water as a absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent