Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A water regulating valve opens when

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

2: When must refrigeration system covered by the code be inspected?

  • Not required
  • Annually
  • Annually and when installed
  • Upon installation

3: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • opening at the pump inlet
  • opening at the pump outlet
  • cooling temperature set-point
  • adjustment of the spring tension of the TXV

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

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

5: A High-Probability System

  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space
  • 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

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

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

7: A hissing noise at the expansion valve is a good indication that

  • gas is passing thru it
  • nothing is passing thru
  • expansion valve is oversized
  • liquid is passing thru it

8: Most CFC's are

  • inert but toxic
  • toxic
  • inert
  • flammable

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

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

10: Cooling tower lowers condenser water temp by

  • running water thru a secondary heat exchanger
  • evaporative cooling
  • condensation
  • running fans at 100%

11: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

12: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

13: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 970 BTU
  • 24,000 BTU
  • 144 BTU
  • 12,000 BTU

14: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 50% Li-Br, 50% tap water
  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% tap water
  • 40% Li-Br, 60% distilled water

15: Adjusting the spring pressure on a TXV

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

16: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

17: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

18: Ammonia vaporization takes place at what temperature?

  • -460F
  • -110F
  • -32F
  • -28F

19: The first step in mechanical refrigeration is

  • expansion
  • condensation
  • compression
  • evaporation

20: Suction line oil traps should be installed when the condenser is

  • in the basement and the evaporator is on the third floor
  • more than 100' away from the evaporator
  • located outside the operates in temperatures below 35F
  • on the third floor roof and the evaporator is in the basement

21: Pressure is equivalent of

  • Area X Force
  • Force / Area
  • Force X Area
  • Force

22: Transformers are rated in

  • volts
  • volts-ohms
  • volt-amps
  • amps

23: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • High suction pressure and high discharge pressure.
  • Low suction pressure and low discharge pressure
  • High head pressure and low suction pressure
  • Low head pressure and high suction pressure

24: 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

25: A class A3 refrigerant is considered

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