Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When the compressor is below the condensor

  • traps are needed on the oil return line
  • traps are needed on the suction line
  • traps are needed on the discharge line
  • traps are not needed on this type of system

2: A class B1 refrigerant is considered

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

3: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 13.9 lbs
  • 6.6 lbs
  • 44 lbs

4: Machinery rooms must be vented to ______?

  • neutralizing tank
  • basement
  • unoccupied spaces
  • outdoors

5: Color is important in oil because

  • allows you to see into crankcase
  • can tell us something about the refining of oil
  • it makes sight glasses easy to read
  • it indicates the viscoisty.

6: Low pressure chiller systems use what type of compressor?

  • Reciprocating
  • Screw
  • Scroll
  • Centrifugal

7: Ohm's Law indicates Amps X Resistance = ___________.

  • Current
  • Impedance
  • Volts
  • Ohms

8: What type of material can't be used on the outlet of a relief valve?

  • Stainless steel
  • Copper
  • Magnesium alloy
  • PVC

9: What pipe can not be used for refrigeration?

  • K
  • N
  • L
  • M

10: The rupture disc on a low-pressure chiller typically releases pressure at

  • 5 psig
  • 15 psig
  • 0 psig
  • 10 psig

11: On cooling towers, what causes the condenser water to drop

  • sensible heat
  • evaporation of the water droplets
  • tower fans
  • ambient temperatures

12: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation

13: The critical temperature of a refrigerant gas occurs when

  • any decrease in pressure will cause condensation
  • any increase in pressure will not liquefy the gas
  • the gas is no longer saturated
  • the gas returns to a liquid

14: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

15: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 120v
  • 240v
  • 277v
  • 208v

16: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

17: Which of the following is an example of an azeotropic refrigerant?

  • R-134A
  • R-404A
  • R-410A
  • R-500

18: Which is the lowest vacuum?

  • 5 psig
  • 10 psia
  • 1,000 Microns
  • 5" hg

19: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

20: The oil separator is always inserted in the system

  • where it can be easily serviced
  • in a cool spot
  • to prevent oil logging
  • in the discharge line

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

22: Clearance volume

  • has no effect on compressor capacity
  • affects compressor capacity
  • is the same on all compressors
  • varies depending on compressor speed

23: Who approves containers for refrigerants?

  • D.O.E
  • D.O.D
  • E.P.A
  • D.O.T

24: The measurement of heat in a particular substance is

  • latent heat
  • specific heat
  • enthalpy
  • sensible heat

25: Megaohm meters can detect a ground in the

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