Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

2: Two systems using separate refrigerants that are superimposed upon one another is called

  • booster
  • cascade
  • indirect
  • single stage

3: A halide torch is most useful with a freon compression system

  • to release a sticking valve
  • to sweat flanges on the refrigeration piping
  • to detect refrigeration leaks in piping joints
  • to remove from from TXV's and evaporator coils

4: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

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

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

6: How many gallons of water per pound of ammonia do you need?

  • 5
  • 15
  • 1
  • 20

7: Which creates more of a heat load?

  • 30% RH
  • 70% RH
  • 50% RH
  • 90% RH

8: What would be the classification of a church?

  • Industrial
  • Large mercantile
  • Place of assembly
  • Institutional

9: Before replacing a seized compressor, the _______ should be determinded.

  • designed head pressure
  • type of refrigerant
  • current draw
  • cause of seizure

10: What is an egress?

  • An escape route
  • A code violation
  • An entrance or exit
  • A valve put on the low side of the system to prevent frosting

11: What is used to check very low air pressures in air conditioning duct?

  • Manometer
  • Barometer
  • Anemomter
  • Vacuum gauge

12: A class A3 refrigerant is considered

  • non-toxic and non-flammable
  • toxic and non-flammable
  • toxic and somewhat flammable
  • non-toxic but highly flammable

13: A hissing noise at the expansion valve is a good indication that

  • nothing is passing thru
  • expansion valve is oversized
  • gas is passing thru it
  • liquid is passing thru it

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

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

15: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 455 psig, 185 psig
  • 257 psig, 77 psig
  • 350 psig, 120 psig
  • 226 psig, 68 psig

16: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above

17: Which of the following is an example of an azeotropic refrigerant?

  • R-500
  • R-404A
  • R-410A
  • R-134A

18: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

19: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.
  • Nothing must be done

20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 500 lbs
  • 660 lbs
  • 330 lbs

21: "I" represents ____ in the Ohm's law formula.

  • voltage.
  • resistance
  • capacitance
  • amperage

22: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
  • a pressure relief device
  • a fusible plug
  • either a fusible plug or a pressure relief device

23: A chiller entering and leaving temperature difference is?

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

24: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • is a reciprocating type compressor with 2 or more pistons

25: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above