Topics: All categories in the pool
1: R-22 falls under which safety classification?
- A-2
- B-2
- A-1
- B-1
2: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 977.6 watts
- 9,776 watts
- .9776 watts
- 9.776 watts
3: Which winding have the most turns?
- Start
- they have equal amount of turns
- run
- depends on the motor phase
4: Liquid line filter-driers on a 410A system must be rated for no less than
- 1000 psig
- 600 psig
- 200 psig
- 400 psig
5: A mercury bulb controller is not recommended for
- line voltage use
- use where vibration is severe
- line or low voltage use
- low voltage use
6: A moisture indicator must
- change color when exposed to moisture
- be filled with liquid
- be sight side up
- be yellow
7: Can you use Ammonia in industrial applications?
- No, never
- When mixed with R-718
- Yes, Under certain condidtions
- Yes, always
8: Transformers are rated in
- volt-amps
- volts
- volts-ohms
- amps
9: Clearance volume
- has no effect on compressor capacity
- varies depending on compressor speed
- affects compressor capacity
- is the same on all compressors
10: Viscosity is
- measure of weight
- the ability of oil to flow
- a measure of heat content
- the coefficient of external friction
11: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UL and UM
- UM or UL
- UL and UR
12: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
13: Foaming of oil in a compressor is most likely to occur
- at start-up
- when the evaporator temperatures are below 32F
- when there is insufficient air across the condenser(i.e., dirty coil)
- when ambient temperature are low
14: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- True
- depends on the type of refrigerant being used
- False
15: A relief valve shall be located at least ___ above grade.
- 10'
- 15'
- 25'
- 36'
16: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- orange
- blue
- red
17: The purpose of an accumulator is to
- reduce friction loss to the flow of refrigerant
- assure no liquid returns to the compressor
- filter out impurities from the system
- store excess refrigerant from the reciver
18: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.2
- .8
- 1.7
- .1
19: The location of a thermal bulb of a TXV affects
- the amount of liquid returning to the compressor
- subcooling
- the amount of liquid refrigerant in the evaporator
- the amount of liquid in the condenser.
20: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 144 BTU
- 12,000 BTU
- 24,000 BTU
21: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- determine the capacity of the service panel
- read the nameplate data
- check with the utility company
22: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- suction
- nozzle
- baffle
23: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 11F
- 21F
- 9F
- 29F
24: How are a compressor and condenser fan wired?
- parallel-series
- series
- series-parallel
- parallel
25: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- absorbed solution
- weak solution
- strong solution
- concentrated solution