Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

2: Low ambient controls are used when

  • always
  • on air conditioning systems only
  • when systems run all year round
  • economizers are used

3: How many BTU's is produced by one watt of energy

  • 1
  • 2.57
  • 3.41
  • 3.00

4: Class A refrigerants are considered

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

5: How many gallons of water per pound of ammonia do you need?

  • 15
  • 5
  • 20
  • 1

6: Ammonia systems use ____ pressure to adjust oil pressure

  • discharge
  • air
  • stream
  • liquid

7: Class 3 refrigerants are

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

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

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

9: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

10: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 1000F
  • 800F
  • 600F
  • 700F

11: One ton of refrigeration is defined as ______ btu/minute.

  • 720,000
  • 60
  • 12,000
  • 200

12: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the low side
  • upper chamber of the high side
  • lower chamber of the high side
  • upper chamber of the low side

13: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

14: Pressure is equivalent of

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

15: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

16: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • The rate of conduction
  • 1 BTU
  • 1 Kelvin
  • 1 Therm

17: Name a reason that does not cause reduced condenser air quantity

  • Dirty Coil
  • Dirty fan blades
  • Prevailing winds
  • High ambient temperature

18: Capacity control on an absorption system is typically accomplished by varying the

  • rate at which heat is supplied to the generator
  • speed of the chilled water circulatory pump
  • pressure setting on the system's rupture disc
  • speed of the condenser water circulator pump

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

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

20: An oil pressure safety switch should be set at

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

21: 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

22: Which is considered the more efficient condenser?

  • air cooled
  • fan cooled
  • spray cooled
  • water cooled

23: Crankcase heaters are energized

  • when the compressor is off
  • while the compressor is running
  • to allow easy compressor start-up
  • to prevent compressor freeze-up

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

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

25: Who authorizes changes to the safety codes?

  • Person in charge of the facility
  • Person who pulled the permit
  • Contractor who last serviced the system.
  • Board of Boilers