Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • voltage.
  • resistance
  • amperage
  • capacitance

2: What is the minimum size wire you can use on a 30 amp circuit?

  • 14 AWG
  • 12 AWG
  • 10 AWG
  • 16 AWG

3: The purpose of an accumulator is to

  • store excess refrigerant from the reciver
  • reduce friction loss to the flow of refrigerant
  • assure no liquid returns to the compressor
  • filter out impurities from the system

4: Suction valve unloaders afford an effective means of

  • superheat control
  • capacity control
  • refrigerant control
  • evaporator control

5: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 226 psig, 68 psig
  • 455 psig, 185 psig.
  • 365 psig, 120 psig
  • 257 psig, 77 psig

6: The measurement of heat in a particular substance is

  • enthalpy
  • sensible heat
  • latent heat
  • specific heat

7: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 3/32"
  • 1/16"
  • 1/8"

8: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 25%
  • 2%
  • 4%

9: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 100%
  • 75%
  • 80%
  • 90%

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

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

11: The color code of a tank of ammonia is

  • lavender
  • silver
  • white
  • light green

12: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Wet bulb temperature
  • Critical temperature
  • Dry bulb temperature
  • Saturated temperature

13: Low pressure systems have what kind of compressor?

  • Centrifugal
  • Scroll
  • Reciprocating
  • Rotary

14: All serviceable components of a refrigeration system shall be provided with

  • manufactures instructions on start-up procedures
  • service manuals
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • safe access

15: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • At least 30'
  • There is no minimum for relief valve and windows.
  • At least 40'

16: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 40% Li-Br, 60% tap water
  • 60% Li-Br, 40% distilled water
  • 50% Li-Br, 50% tap water
  • 40% Li-Br, 60% distilled water

17: What is the maximum voltage range allowed on an electrical circuit?

  • 10%
  • 5%
  • 15%
  • 20%

18: It takes how many BTU/hr to melt one pound of ice at 32F

  • 180
  • 212
  • 144
  • 970

19: What is the leaving chilled water set point for water chiller systems?

  • 38F
  • 66F
  • 45F
  • 55F

20: 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?

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

21: The critical temperature of a refrigerant gas occurs when

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

22: A solder joint melts at temperatures of

  • 400F to 800F
  • 600F to 900F
  • less than 400F
  • 1,200F to 1,500F

23: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

24: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

25: 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 where the refrigerant comes in contact with the space refrigerated
  • is a self-contained complete factory made and tested system