Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the boiling point of refrigerant governed by?

  • Evaporator temperature
  • P&T relationship
  • Compressor RPM's
  • Condenser sub-cooling

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

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

3: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 3/8"
  • 1/2"
  • 3/4"
  • 5/8"

4: A VRF system is a direct system

  • true
  • false

5: A halide torch is most useful with a freon compression system

  • to detect refrigeration leaks in piping joints
  • to release a sticking valve
  • to sweat flanges on the refrigeration piping
  • to remove from from TXV's and evaporator coils

6: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 108
  • 38
  • 116
  • 88

7: The Board of Boilers adopts by reference

  • the MACS Pressure Vessel Code of Massachusetts
  • Montreal Protocol Safety Code
  • MSCA Code
  • the 1997 ANSI/ASHRAE Safety Code

8: Increasing superheat will do what to your system?

  • Increase liquid flow
  • Nothing
  • Decrease liquid flow
  • Increase gas flow

9: Refrigerant restricted in 2004 but used for transition for decades:

  • R-22
  • R-11
  • R-134A
  • R-123

10: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

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

  • 212
  • 144
  • 970
  • 180

12: Ammonia vaporization takes place at what temperature?

  • -110F
  • -32F
  • -28F
  • -460F

13: Heat transferred by conduction from one body to another is done

  • via radiation
  • via liquids
  • via solids
  • via heat rays

14: Viscosity is

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

15: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 10,000
  • 100,000
  • 100
  • 1,000

16: One ton of refrigeration is defined as ______ btu/minute.

  • 200
  • 12,000
  • 60
  • 720,000

17: How far from the ground does a relief valve need to be?

  • At least 20' above grade
  • Not more than 3' above grade
  • At least 25' above grade
  • At least 15' above grade

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

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

19: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -100F to -40F
  • 0F-38F
  • 30F to 50F
  • -40F to 0F

20: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 75%
  • 80%
  • 90%
  • 100%

21: 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

22: The location of a thermal bulb of a TXV affects

  • subcooling
  • the amount of liquid in the condenser.
  • the amount of liquid refrigerant in the evaporator
  • the amount of liquid returning to the compressor

23: Two systems using separate refrigerants that are superimposed upon one another is called

  • booster
  • indirect
  • single stage
  • cascade

24: A relief valve discharge capacity is rated in

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

25: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UM or UL
  • UL and UR
  • UV or UR
  • UL and UM