Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

2: A class A3 refrigerant is considered

  • non-toxic and non-flammable
  • toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable

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

  • Instituional
  • Industrial
  • Place of assembly
  • Large mercantile

4: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 6.6, 6.6
  • 2.5, 3.0
  • 2.5, 2.5
  • 3.0, 3.5

5: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

6: Which creates more of a heat load?

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

7: How much clearance do you need around the perimeter of electrical panels?

  • 36"
  • 12"
  • 18"
  • 24"

8: A relief valve discharge capacity is rated in

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

9: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 100
  • 250
  • 350
  • 400

10: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's a non-flammable refrigerant
  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's cheap
  • Because it's water

11: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • king valves
  • companion or block valves
  • gate or globe valves
  • ball valves

12: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and the solution will evaporate.
  • The machine will cool excessively as the solution evaporates

13: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

14: A thermometer inside a duct measures ____ heat.

  • specific
  • sensible
  • hidden
  • latent

15: What are the three components of a transformer?

  • Contacts, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.
  • Primary coil, secondary coil, and copper contacts
  • Primary coil, secondary coil, and core

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

  • Scroll
  • Rotary
  • Reciprocating
  • Centrifugal

17: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 58F
  • 70F
  • 32F
  • 77F

18: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

19: The discharge relief valve is located (9.4.6)

  • between the compressor and oil separator
  • between the compressor and the stop valve
  • on top of the condensor
  • between the compressor and reciever

20: What is the refrigerant chlorodifluoromethane?

  • R-123
  • R-134a
  • R-12
  • R-22

21: An accumulator can be located between the

  • condenser and evaporator
  • compressor and condenser
  • first stage and second stage compressors
  • evaporator and compressor

22: 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?

  • 58
  • 88
  • 38
  • 96

23: 1 Watt = ______ BTU's?

  • 12
  • 7.216
  • 4.482
  • 3.412

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

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

25: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • low oil pressure
  • low suction pressure
  • high suction pressur