Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • 15
  • 20
  • 1
  • 5

2: Cooling tower lowers condenser water temp by

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

3: Where must a refrigeration contractor's license number be displayed?

  • Truck, office, every job, and on all equipment
  • Trucks, license plates, and uniforms
  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.

4: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

5: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

6: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

7: When using nitrogen for brazing, the pressure should be:

  • Slightly below atmospheric
  • Very low
  • 50-100 psig
  • 125 psig

8: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-volumetric displacement compressor
  • negative displacement compressor
  • non-positive displacement compressor
  • neutral chamber-type compressor

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

  • 150
  • 330
  • 200
  • 100

10: The External equalizer of a TXV compensates for

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

11: Can ammonia be used on domestic system?

  • no, unless there is proper ventilation system installed
  • no
  • yes, for systems under 10 tons
  • yes

12: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

13: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

14: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • printed circuit board (PCB)
  • duel-voltage switch
  • centrifugal switch

15: A high side float is a

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

16: 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)

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

17: A tachometer is an instrument used to measure

  • RPM
  • static pressure
  • air velocity
  • speed

18: A split-phase motor has a ______ winding and a ____ winding

  • duel-run, duel-start
  • run, start
  • run, common
  • start, common

19: It takes how many BTU/hr to melt one pound of ice at 32F

  • 144
  • 970
  • 212
  • 180

20: "P" represents ______ in the Watt's law formula

  • watts
  • amperage
  • voltage
  • reactance

21: What is the minimum size wire you can use on a 30 amp circuit?

  • 16 AWG
  • 12 AWG
  • 14 AWG
  • 10 AWG

22: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

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

  • True
  • False

24: Class 3 refrigerants are

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

25: A High-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such 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