Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • blown to the atmosphere by the fan
  • remain in the air
  • washed out of the air by the spray pump

2: Machinery rooms must be vented to ______?

  • basement
  • outdoors
  • neutralizing tank
  • unoccupied spaces

3: An oil pressure safety switch should be set at

  • 5 to 10 psi below low side pressure
  • 5 to 10 psi above low side pressure
  • 10 to 15 psi below low side pressure
  • 10-15 psi above low side pressure

4: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

5: A water regulating valve opens when

  • the head pressure rises
  • the compressor is on
  • when the power is on
  • when the power is on there is an overcharge of refrigerant

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

  • Instituional
  • Place of assembly
  • Large mercantile
  • Industrial

7: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

8: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • R-414B
  • Cascade
  • Low pressure
  • Simple

9: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • baffle
  • nozzle
  • suction
  • volute

10: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

11: E = I X R is

  • Amps Law
  • Ohms Law
  • Impedance Law
  • Watts Law

12: Ammonia vaporization takes place at what temperature?

  • -110F
  • -28F
  • -460F
  • -32F

13: Ammonia is under what safety classification?

  • B3
  • B1
  • B2
  • A3

14: Pressure relief valves shall be marked with the data from

  • Section VIII Division of the ASME Boiler & Pressure Code
  • Section XIII Division of the ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code

15: On a centrifugal compressor, stationary diffuser vanes are needed to

  • stop gas flow
  • increase the clearance space
  • prevent high pressure on the packing
  • convert velocity energy to pressure

16: By using nitrogen within a pipe during brazing operation,

  • Copper oxide formation is prevented
  • The explosion hazard is confined
  • Discoloration is prevented
  • Exterior scale formation is minimized

17: A Lithium-bromide system is an absorption system that

  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses ammonia as a refrigerant and lithium bromide as an absorbent
  • uses water as a absorbent and lithium bromide as a refrigerant
  • uses water as a refrigerant and lithium bromide as an absorbent

18: Sensible heat is the heat added to a substance to

  • cause evaporation
  • freeze it
  • raise its temperature
  • change its state

19: Total heat of a substance is considered

  • empathetical
  • enthalpy
  • specific heat
  • sensible heat

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

  • 77F
  • 58F
  • 70F
  • 32F

21: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • strong solution
  • concentrated solution
  • weak solution
  • absorbed solution

22: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class M machinery room
  • Class T machinery room
  • Class A machinery room
  • Class B machinery room

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

24: A run capacitor is wired in series with the _____ windings.

  • run
  • common
  • start capacitor
  • start

25: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • low suction pressure
  • high head pressure
  • increased capacity