Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A chiller entering and leaving temperature difference is?

  • 5 degrees F
  • 10 degrees F
  • 20 degrees F
  • 50 degrees F

2: Ammonia can come in contact with _______ ?

  • Aluminum
  • Copper tubing
  • Brass
  • Copper

3: What is an example of institutional occupancy?

  • Hospital
  • Shopping mall
  • Dorms
  • Football stadium

4: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

5: When an electronic bridge is in balance the bridge output will be

  • 0 volts
  • 1 volt
  • .01 volts
  • 15 volts

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

  • refractometer
  • anemometer
  • Psychrometer
  • hydrometer

7: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • series
  • junction
  • parallel

8: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 720,000
  • 12,000
  • 200

9: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and reciever
  • between the compressor and oil separator
  • between the compressor and the stop valve

10: A low oil switch is typically

  • automatic reset
  • non used on semi-hermetic compressors over 10 ton capacity
  • manual reset
  • time-delay auto reset

11: What must be done to refrigerant pipes before being buried?

  • Certified
  • Leaked checked
  • Coated
  • Encased

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

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

13: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

14: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

15: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

16: How much refrigerant can be stored in a mechanical room outside of the system?

  • 200
  • 150
  • 330
  • 100

17: Pressure vessels with an internal volume of 3 cubic feet or less

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

18: A EPR valve is installed on what type of evaporators?

  • high-temperature evaporators
  • plate evaporators
  • low-temperature evaporators
  • shell and tube evaporators

19: A micron is

  • one millonths of a centimeter
  • one millonths of a micrometer
  • one thousandths of a millimeter
  • a larger unit of measurement than Hg

20: Foaming of oil in a compressor is most likely to occur

  • when there is insufficient air across the condenser(i.e., dirty coil)
  • when the evaporator temperatures are below 32F
  • at start-up
  • when ambient temperature are low

21: The critical temperature of a refrigerant gas occurs when

  • the gas is no longer saturated
  • any decrease in pressure will cause condensation
  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid

22: A secondary coolant is defined as

  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
  • any refrigerant direcly in contact with the cooling space for process cooling
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • a low temperature refrigerant used for cascading systems

23: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Cascade
  • Simple
  • R-414B
  • Low pressure

24: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • outside the room, immediately adjacent to each door
  • on a conspicuous card located near the evaporator
  • on a conspicuous card located near the compressor
  • inside the room, immediately adjacent to each door

25: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or less
  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or more