Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-11 has the greatest corrosive effect on

  • Magnesium
  • Aluminum
  • Bronze
  • Copper

2: Thermodynamics is the branch of science that deals with

  • energy due to motion
  • heat energy
  • state of energy
  • molecular therory

3: 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

4: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Exterior scale formation is minimized
  • Discoloration is prevented
  • Copper oxide formation is prevented

5: The formula for Pure Power in a resistance circuit is

  • Watts = volts X amps
  • Watts X amps.
  • Kw = volts X amps
  • Watts X power factor

6: A direct system

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

7: Color is important in oil because

  • it indicates the viscoisty.
  • allows you to see into crankcase
  • it makes sight glasses easy to read
  • can tell us something about the refining of oil

8: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil level will rise
  • oil will thicken
  • oil will foam

9: Watt's Law indicates Volts X Amps = _________.

  • Resistance
  • Watts
  • Current
  • Ohms

10: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 9.776 watts
  • .9776 watts
  • 977.6 watts
  • 9,776 watts

11: What instrument is used to measure very high resistance?

  • tape measure
  • meg ohmmeter
  • voltmeter
  • ammeter

12: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 4
  • 2
  • 3
  • 5

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

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

14: A run capacitor is wired in series with the _____ windings.

  • start
  • start capacitor
  • run
  • common

15: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • zone valve
  • high limit control
  • low limit control

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

  • 550 lbs
  • 660 lbs
  • 55 lbs
  • 330 lbs.

17: Cooling tower lowers condenser water temp by

  • evaporative cooling
  • running water thru a secondary heat exchanger
  • running fans at 100%
  • condensation

18: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with RX-11
  • Flush with R-11
  • Flush with ammonia
  • Flush with R-718

19: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the chilled water circulatory pump
  • pressure setting on the system's rupture disc
  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator

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.
  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line
  • Nothing must be done

21: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

22: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

23: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Scroll
  • Centrifugal
  • Rotary

24: How many closing forces operate a thermostatic expansion valve?

  • 4
  • 3
  • 2
  • 1

25: Humidity can be sensed with

  • human hair
  • pressure bellows
  • thermometer
  • bimetal