Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: "R" represents ___ in the Ohm's law formula

  • voltage
  • amperage
  • capacitance
  • resistance

2: What would be the classification for Stop & Shop grocery store?

  • Instituional
  • Large mercantile
  • Industrial
  • Place of assembly

3: Which creates more of a heat load?

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

4: What is considered a cooling agent?

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

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

  • 150
  • 200
  • 330
  • 100

6: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

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

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

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

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

9: Ammonia (NH3) is a group III refrigerant

  • True
  • False

10: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 10 amps
  • 5 amps
  • 15 amps
  • 20 amps

11: A low oil switch is typically

  • manual reset
  • automatic reset
  • non used on semi-hermetic compressors over 10 ton capacity
  • time-delay auto reset

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

  • A3
  • B2
  • A2
  • C3

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

  • Reciprocating
  • Scroll
  • Centrifugal
  • Rotary

14: If the power element of an expansion valve should lose its charge the valve would

  • go open
  • go closed
  • overfeed the evaporator
  • underfeed the evaporator

15: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

16: The principle used in continuous type absorption systems is

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

17: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 75%
  • 80%
  • 99%
  • 90%

18: A VRF system is a direct system

  • true
  • false

19: Fractionation occurs when

  • 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
  • the pressures increase as the heat load increases

20: The density of a gas refers to

  • pounds per square foot
  • pounds per absolute pressure
  • pounds per cubic foot
  • cubic feet per pound

21: What would be the classification of a church?

  • Institutional
  • Large mercantile
  • Place of assembly
  • Industrial

22: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Foot valve
  • Stop valve
  • Muffler
  • Moisture indicator

23: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 96
  • 88
  • 58
  • 38

24: Increasing superheat will do what to your frost line?

  • Could either increase or decrease depending on the load conditions
  • Decrease
  • Nothing
  • Increasae

25: Oils, classified as to source, are

  • naphthalene, paraffin, and castor
  • animal, vegetable, and castor
  • animal, vegetable, and mineral
  • naphthalene, mixed, and paraffin