Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 20'
  • 30'
  • 15'

2: A start capacitor in series with a start winding will

  • increase the amp draw of the motor
  • increase starting torque
  • increase running efficiency
  • decrease the amp draw of the motor

3: A thermometer inside a duct measures ____ heat.

  • latent
  • hidden
  • sensible
  • specific

4: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-1
  • B-2
  • A-1

5: The principle used in continuous type absorption systems is

  • Dalton's Law
  • Ohm's Law
  • Boyle's Law
  • Charles's Law

6: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • boost voltage
  • pick-up voltage
  • lift voltage
  • run voltage

7: How are a compressor and condenser fan wired?

  • parallel-series
  • parallel
  • series-parallel
  • series

8: A relief valve discharge capacity is rated in

  • temperature minus pounds of air per second divided by release rate squared
  • PSIA
  • PSIG
  • Pounds of air per minute.

9: What device should be used on low-temperature freezers?

  • discharge muffler
  • oil separator
  • hot-gas by-pass
  • high capacity TXV

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

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

11: An example of an "Expendable Refrigerant" is

  • ammonia
  • liquid nitrogen
  • lithium bromide
  • liquid oxygen

12: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 100
  • 330
  • 200

13: How many refrigerant classifications are there for flammability?

  • 3
  • 7
  • 1
  • 2

14: Viscosity is

  • the ability of oil to flow
  • the coefficient of external friction
  • a measure of heat content
  • measure of weight

15: The best way to determine the voltage requirement for an electrical component is to

  • read the nameplate data
  • determine the capacity of the service panel
  • read the voltage with a mulitmeter
  • check with the utility company

16: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UL”
  • “UV”
  • “U” or “UM”
  • “UM” and “UV”

17: The heat picked up in the evaporator must equal to

  • the heat of compression
  • the heat gained by the condenser
  • the heat lost by the medium being cooled
  • the heat giving by the condenser

18: A solder joint melts at temperatures of

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

19: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

20: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and dipstick

21: A hotel is considered a _______ occupancy.

  • mercantile
  • residential
  • commercial
  • institutional

22: Fractionation occurs when

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

23: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

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

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

25: A split-phase motor has a ______ winding and a ____ winding

  • duel-run, duel-start
  • run, common
  • start, common
  • run, start