Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which refrigerant class listed below is the most flammable?

  • A-1
  • B-2
  • A-3
  • C-3

2: Where is an EPR valve located on a multi-evaporator system?

  • Suction line at the compressor
  • Suction line of the coolest evaporator
  • Suction line prior to the accumulator of the lowest temperature system
  • Suction line of the warmest evaporator

3: What is Absolute Zero?

  • -400F
  • -640F
  • -773F
  • -460F

4: Fractionation occurs when

  • 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 decreases as the heat load decreases
  • the pressures increase as the heat load increases

5: The difference between saturated liquid and saturated vapor is

  • heat
  • volume
  • temperature
  • pressure

6: What is not a requirement of a class T machine room?

  • fire hose connection to the building fire protection system
  • automatic ventilation
  • self-closing doors
  • tight fitting doors

7: Usually dry bulb temperature is

  • higher than wet bulb temperature
  • same as wet bulb temperature
  • lower than dry bulb temperature
  • not important and shall be ignored

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

  • Barometer
  • Anemomter
  • Manometer
  • Vacuum gauge

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

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

10: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

11: Which oil is hydoscopic?

  • SW30
  • mineral
  • animal
  • polyolester

12: What is considered a cooling agent?

  • any liquid used for the transmission of heat when vaporization occurs
  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat without condensation

13: What type of pressure relief device is used on a CO2 system?

  • Glove valve
  • Gate valve
  • Fusible plug
  • Rupture disk

14: How many square inches per square foot?

  • 24
  • 98
  • 64
  • 144

15: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

16: NH3 is

  • lithium bromide
  • R-718
  • R-508A
  • ammonia

17: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

18: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • lost heat
  • specific heat
  • latent heat
  • sensible heat

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

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

20: Ammonia (NH3) is a group III refrigerant

  • True
  • False

21: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 45F
  • 158F
  • 32F
  • 155F

22: Ammonia vaporization takes place at what temperature?

  • -32F
  • -28F
  • -110F
  • -460F

23: Which occupancy can ammonia be used in?

  • commercial
  • depends on the quantity of freon
  • industrial
  • redifential

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

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

25: The leaving chilled water set point for comfort cooling is typically?

  • 45
  • 66
  • 38
  • 60