Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: On a large centrifugal system, what meters the flow to the evaporator?

  • TXV
  • Low side float
  • High side float
  • Cap tube.

2: Suction line oil traps should be installed when the condenser is

  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator
  • in the basement and the evaporator is on the third floor
  • on the third floor roof and the evaporator is in the basement

3: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

4: A rule of thumb in air conditioning is ____ CFM per ton?

  • 100
  • 500
  • 400
  • 600

5: Name three things that must be done when changing refrigeration lubricant?

  • Nothing must be done
  • Place sign, check for leaks, insulate
  • Make sure it's compatible, notify owner, notify AHJ
  • You can't change lubricants.

6: A chiller entering and leaving temperature difference is?

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

7: Dew point is

  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate
  • the temperature below which water vapor in the air will start to condense
  • the temperature of air of 50% RH

8: The two basic types of evaporators are

  • flooded and direct expansion
  • direct expansion and plate
  • finned and plate
  • prime surface and finned

9: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

10: 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?

  • 40 uf
  • 15 uf
  • 20 uf
  • 25 uf

11: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • nearly the same
  • far apart or greater difference

12: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Moisture indicator
  • Muffler
  • Foot valve

13: Electricity involves the movement of electrons in atoms

  • True
  • False

14: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -100F to -40F
  • -40F to 0F
  • 30F to 50F
  • 0F-38F

15: Which is considered the more efficient condenser?

  • fan cooled
  • air cooled
  • water cooled
  • spray cooled

16: Fractionation occurs when

  • the pressures decreases as the heat load decreases
  • when a fraction of refrigerant is added as the full charge
  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • the pressures increase as the heat load increases

17: Start to Run windings will have what resistance?

  • All will be at equal values
  • The most resistance value
  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value

18: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • licensed technician
  • welder qualified
  • licensed welder
  • competent welder

19: A restaurant is classified as a

  • large mercantile occupancy
  • mixed occupancy
  • public assembly occupancy
  • commercial occupancy

20: A motor starter contains a thermal overload and a

  • solenoid
  • 3-way relay
  • transformer
  • contactor

21: When must refrigeration system covered by the code be inspected?

  • Not required
  • Upon installation
  • Annually and when installed
  • Annually

22: 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

23: How many square inches per square foot?

  • 24
  • 98
  • 144
  • 64

24: R-22 is considered a(n)

  • CFC
  • HFC
  • HCFCH
  • HCFC

25: The color code of a tank of ammonia is

  • silver
  • light green
  • white
  • lavender