Topics: All categories in the pool
1: A start capacitor in series with a start winding will
- decrease the amp draw of the motor
- increase running efficiency
- increase the amp draw of the motor
- increase starting torque
2: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 20 uf
- 15 uf
- 40 uf
- 25 uf
3: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- critical pressure
- low pressure
- design pressure
4: A start capacitor is wired in _____ with the start windings.
- series-parallel
- junction
- parallel
- series
5: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
6: An accumulator can be located between the
- evaporator and compressor
- condenser and evaporator
- first stage and second stage compressors
- compressor and condenser
7: What would be the classification for Stop & Shop grocery store?
- Place of assembly
- Industrial
- Large mercantile
- Instituional
8: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- you can't change refrigerants
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
9: What is potential measured in?
- Amps
- Volts
- Henrys
- Ohms
10: A hissing noise at the expansion valve is a good indication that
- nothing is passing thru
- gas is passing thru it
- liquid is passing thru it
- expansion valve is oversized
11: One atmosphere equals
- 29.4
- 14.7
- 0 psig
- 0 psia
12: The main purpose of the accumulator is to
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
- provide space for vapor to accumulate
- prevent liquid slugs at the compressor
13: What refrigerant doesn't have to be classifted?
- R-711
- R-134a
- R-718
- R-717
14: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Leak tested
- Insulated
- Pressurized
15: Transformers are rated in
- volts
- volt-amps
- volts-ohms
- amps
16: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
17: 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 release a sticking valve
- to remove from from TXV's and evaporator coils
18: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 110
- 100
- 80
19: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
20: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- you can never change refrigerants
21: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 330
- 110
22: A class B1 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
23: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- anemometer
- hydrometer
- Psychrometer
24: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 3.0
- 5.5
- 2.0
25: A tachometer is an instrument used to measure
- speed
- air velocity
- static pressure
- RPM