Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • commercial occupancy
  • public assembly occupancy
  • institutional occupancy
  • illegal occupancy

2: The heat picked up in the evaporator must equal to

  • the heat gained by the condenser
  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled

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

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

4: "E" references ____ in the Ohm's law formula

  • voltage
  • amperage
  • resistance
  • capacitance

5: What is NOT a positive displacement compressor.

  • Rotary
  • Reciprocating
  • Scroll
  • Centrifugal

6: Brazed joints melt at temperatures above

  • 800F
  • 500F
  • 1,000F
  • 1,200F

7: Adjusting the spring pressure on a TXV

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

8: A class B2 refrigerant is considered

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

9: 746 watts is equal to

  • 1 hp
  • Pi
  • 100 hp
  • 10 hp

10: 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

11: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 75
  • 20
  • 15
  • 50

12: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

13: Usually dry bulb temperature is

  • higher than wet bulb temperature
  • same as wet bulb temperature
  • not important and shall be ignored
  • lower than dry bulb temperature

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

  • 277v
  • 208v
  • 240v
  • 120v

15: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • boost voltage
  • lift voltage
  • pick up voltage
  • run voltage

16: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and the stop valve
  • between the compressor and reciever

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

  • 3.00
  • 2.57
  • 1
  • 3.41

18: What device measures the specific gravity of a substance?

  • Hygrometer
  • Hydrometer
  • Manometer
  • Thermometer

19: A high side float is a

  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the crankcase oil level
  • float type valve that controls the amount of refrigerant stored in the receiver

20: Class T machine room

  • shall include closets used for setting equipment
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • has no flame producing apparatus permanently installed
  • shall have remote controls to stop the action of the refrigerant compressor

21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-12
  • R-22
  • R-11

22: B3 refrigerants are considered

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

23: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 33
  • 22
  • 18
  • 50

24: The first step in mechanical refrigeration is

  • condensation
  • expansion
  • compression
  • evaporation

25: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Make sure its compatible, notify owner, and notify AHJ.
  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line
  • you can never change refrigerants