Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The two float-type metering devices are the

  • high-side float and the low-side float
  • vapor float and the low-side float.
  • liquid float and the low-side float
  • liquid float and the vapor float

2: A water regulating valve opens when

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

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

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

4: What measures gas pressure?

  • Hygrometer
  • Manometer
  • Hydrometer
  • Barometer

5: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 20 uf
  • 15 uf
  • 25 uf
  • 40 uf

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

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

7: Pressure is equivalent of

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

8: The External equalizer of a TXV compensates for

  • pressure within the evaporator
  • pressure within the system
  • pressure drop across the evaporator coil
  • pressure drop across the condenser coil

9: Capacitors are rated in

  • volt - amperes
  • megaohms
  • micro-farads
  • kelvins

10: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

11: R22 and 410A operate at the same range of condensing and evaporating temperatures

  • true
  • false

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

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

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

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

14: Volts x amps equals

  • Watts
  • Inductance
  • Ohms Law
  • Impedance

15: If the power element on an expansion valve should lose its charge, the valve would

  • Under feed
  • Over feed
  • Close
  • Stay open

16: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 110
  • 1,000
  • 6.6
  • 330

17: Where would the EPR valve be located on a multiple evaporator system?

  • inlet of the low temperature evaporator.
  • outlet of high temperature evaporator
  • outlet of low temperature evaporator
  • outlet of the liquid line

18: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

19: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 1000 watts
  • 746 watts
  • 600 watts
  • 5KW

20: What is a Category "D" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact

21: R-11 has the greatest corrosive effect on

  • Magnesium
  • Aluminum
  • Copper
  • Bronze

22: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 100
  • 330
  • 200

23: A class B2 refrigerant is considered

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

24: A tachometer is an instrument used to measure

  • speed
  • static pressure
  • air velocity
  • RPM

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

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