Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Low ambient controls are used when

  • economizers are used
  • when systems run all year round
  • always
  • on air conditioning systems only

2: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • Rust can form
  • The Li-Br solution will become more concentrated
  • The Li-Br solution will become more diluted
  • System operating pressure will drop

3: Most CFC's are

  • flammable
  • inert
  • inert but toxic
  • toxic

4: Adjusting the spring pressure on a TXV

  • adjusts the bulb charge
  • makes no difference
  • changes superheat
  • changes subcooling

5: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is a self-contained complete factory made and tested system
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated

6: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • hydrometer
  • Psychrometer
  • refractometer
  • anemometer

7: How many refrigerant classifications are there for flammability?

  • 3
  • 7
  • 1
  • 2

8: What is the refrigerant chlorodifluoromethane?

  • R-12
  • R-134a
  • R-123
  • R-22

9: An accumulator can be located between the

  • compressor and condenser
  • condenser and evaporator
  • first stage and second stage compressors
  • evaporator and compressor

10: Name a reason that does not cause reduced condenser air quantity

  • Dirty fan blades
  • Dirty Coil
  • High ambient temperature
  • Prevailing winds

11: "E" represents _____ in the Watt's law formula.

  • reactance
  • amperage
  • watts
  • voltage

12: What will occur if the strong solution in an absorption chiller becomes too strong?

  • 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.
  • The machine will stop cooling and the solution will evaporate.

13: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

14: The certificate of inspection

  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be authorized by a notarized insurance company
  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be posted and protected from dirt, water, and other elements

15: Booster compressors, pump refrigerant into the

  • heat & plate heat exchanges
  • receiver
  • high side of the secondary compressor
  • low side of the primary compressor

16: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low suction pressure
  • high head pressure
  • increased capacity
  • low pressure chillers do not have purge units

17: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • diluted solution
  • absorbed solution
  • strong solution
  • weak solution

18: What device should be used on low-temperature freezers?

  • discharge muffler
  • high capacity TXV
  • oil separator
  • hot-gas by-pass

19: A moisture indicator must

  • be yellow
  • be filled with liquid
  • change color when exposed to moisture
  • be sight side up

20: What is Trichlorotrifluoromethane?

  • R-11
  • R-113
  • R-13
  • R-12

21: Ohm's Law indicates Amps X Resistance = ___________.

  • Ohms
  • Volts
  • Current
  • Impedance

22: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

23: Pressure relief valves shall be marked with the data from

  • Section VIII Division of the ASME Boiler & Pressure Code
  • Section XIII Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code

24: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

25: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection
  • shall use pressure relief devices
  • shall use fusible plugs