Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-1
  • A-2
  • B-2
  • A-1

2: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Pressure Temperature
  • Adiabatic
  • Isothermal
  • Volume Temperature

3: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Enthalpy
  • Specific heat
  • Latent heat
  • Sensible heat

4: 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?

  • 88
  • 58
  • 96
  • 38

5: The actual expansion curve of compressor follows most nearly which one of the following

  • Adiabatic
  • Isothermal
  • Volume
  • Pressure-Temperature

6: In a motor, an internal overload might open if

  • there's a direct short
  • there's an open start winding
  • there's an excess current draw through the motor
  • there was a high pressure refrigerant was used for a low pressure system.

7: "I" represents _______ in the Watt's law formula.

  • amperage
  • voltage
  • watts
  • reactance

8: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

9: Which oil is hydoscopic?

  • animal
  • polyolester
  • SW30
  • mineral

10: A High-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space

11: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

12: 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

13: Lithium-bromide, Li-Br, is best characterized as a

  • sand
  • soil
  • sugar
  • salt

14: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 55
  • 15
  • 75
  • 50

15: 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.

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

16: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

17: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?

  • CFM and HP increase
  • CFM and HP decrease
  • CFM and RPM decrease
  • RPM and CFM increase

18: Which refrigerant is lighter than air?

  • R-717
  • R-123
  • R-11
  • R-134a

19: If the spring is adjusted to increase the superheat, this new setting will

  • lengthen the frost line
  • shorten the frost line
  • have no effect on the frost line
  • allow more liquid into the evaporator

20: What would be the classification of a church?

  • Large mercantile
  • Institutional
  • Industrial
  • Place of assembly

21: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with ammonia
  • Flush with RX-11
  • Flush with R-718
  • Flush with R-11

22: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

23: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection as well as a temperature protection device
  • over pressure protection
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection and a rupture disc

24: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • low pressure
  • design pressure
  • high pressure
  • critical pressure

25: The most common type of motor starter is

  • delts-wye starter
  • duel-winding starter
  • across the line starter
  • part winding starter