Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When energized, a normally open relay will be

  • open
  • closed
  • noisy
  • depends on the type and class of the relay

2: A start capacitor in series with a start winding will

  • increase the amp draw of the motor
  • decrease the amp draw of the motor
  • increase running efficiency
  • increase starting torque

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

  • 208v
  • 120v
  • 277v
  • 240v

4: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?

  • 506v
  • 550v
  • 660v
  • None of the above

5: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • At least 20' above grade
  • At least 15' above grade
  • Not more than 3' above grade

6: What measures gas pressure?

  • Hygrometer
  • Manometer
  • Barometer
  • Hydrometer

7: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

8: Give an example of a secondary coolant?

  • R-717
  • R-12
  • R-410A
  • R-718

9: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • Rust can form
  • System operating pressure will drop
  • The Li-Br solution will become more diluted
  • The Li-Br solution will become more concentrated

10: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 11F
  • 9F
  • 21F
  • 29F

11: The generator shell contains the

  • condenser and the generator
  • condenser, the evaporator, and the generator
  • evaporator and the absorber
  • condenser and the absorber

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

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

13: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

14: Class 3 refrigerants are

  • non-toxic
  • highly flammable
  • non-flammable
  • toxic

15: What is a Category "D" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • 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
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F

16: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • high pressure
  • critical pressure
  • low pressure
  • design pressure

17: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

18: If your suction line is warmer than the room temperature, this may indicate

  • an over charge
  • plugged air filter
  • below normal superheat
  • a low charge

19: How is bring measured?

  • anemometer
  • hydrometer
  • hygrometer
  • manometer

20: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

21: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 25%
  • 2%

22: What device should be used on low-temperature freezers?

  • high capacity TXV
  • discharge muffler
  • oil separator
  • hot-gas by-pass

23: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 55 lbs
  • 120 lbs
  • 65 lbs

24: Viscosity is

  • the ability of oil to flow
  • measure of weight
  • the coefficient of external friction
  • a measure of heat content

25: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 45
  • 38
  • 66