Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In a system designed for sub-zero ambient temperatures, what must be added?

  • Booster compressor
  • Nitrogen
  • Infrared dye for leak identification
  • Low-ambient kit

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

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

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

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

4: What is NOT a positive displacement compressor.

  • Reciprocating
  • Centrifugal
  • Scroll
  • Rotary

5: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 2
  • 4
  • 5
  • 3

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

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

7: What type of oil is used in R-410A systems?

  • mineral oil
  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene

8: Megaohm meters can detect a ground in the

  • up to 1,000 ohms
  • 10,000,000 ohms or higher
  • up to 10,000 ohms
  • up to 1,000,000 ohms

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

  • Isothermal
  • Pressure-Temperature
  • Volume
  • Adiabatic

10: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants

11: A micron is

  • one thousandths of a millimeter
  • one millonths of a micrometer
  • one millonths of a centimeter
  • a larger unit of measurement than Hg

12: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

13: What is potential measured in?

  • Amps
  • Volts
  • Henrys
  • Ohms

14: What is used to check very low air pressures in air conditioning duct?

  • Anemomter
  • Manometer
  • Barometer
  • Vacuum gauge

15: 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.

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

16: An air conditioning system rated for 36,000 BTU's is equivalent to

  • 12,000 tons of cooling
  • two tons of cooling
  • one ton of cooling
  • three tons of cooling

17: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Any employee
  • Anyone, it's a completely safe area
  • Authorized persons only

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

19: Thermodynamics is the branch of science that deals with

  • state of energy
  • energy due to motion
  • molecular therory
  • heat energy

20: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 10
  • 18
  • 15
  • 24

21: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

22: A movie theater would be considered a

  • mixed occupancy
  • commercial occupancy
  • public assembly occupancy
  • institutional occupancy

23: 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.

  • 75
  • 50
  • 55
  • 15

24: Adjusting the spring pressure on a TXV

  • makes no difference
  • changes subcooling
  • adjusts the bulb charge
  • changes superheat

25: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.