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)

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

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

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

3: How are refrigerant blends classified?

  • Based on best case Fractionation
  • Based on the oil used
  • Blends don't have to be classified
  • Based on worst case fractionation

4: Who authorizes changes to the safety codes?

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

5: A Low-Probability System

  • 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 the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space

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

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

7: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • does not require a pressure-limiting device
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed

8: The first step in mechanical refrigeration is

  • condensation
  • compression
  • evaporation
  • expansion

9: R-11 has the greatest corrosive effect on

  • Aluminum
  • Bronze
  • Magnesium
  • Copper

10: How many opening forces operate a thermostatic expansion valve?

  • 3
  • 1
  • 2
  • 4

11: What is Trichlorotrifluoromethane?

  • R-113
  • R-12
  • R-11
  • R-13

12: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

13: A run capacitor is wired in series with the _____ windings.

  • start
  • run
  • common
  • start capacitor

14: Bubbles in the liquid line sight glass could be caused by

  • bad low pressure switch
  • leaking discharge valves in the compressor
  • overcharge of oil
  • plugged drier

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

  • Over feed
  • Close
  • Stay open
  • Under feed

16: 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.

17: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

18: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

19: In a motor, an internal overload might open if

  • there's an open start winding
  • there's a direct short
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's an excess current draw through the motor

20: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • reduce friction loss to the flow of refrigerant
  • store excess refrigerant from the reciver
  • filter out impurities from the system

21: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

22: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?

  • RPM and CFM increase
  • CFM and HP increase
  • CFM and HP decrease
  • CFM and RPM decrease

23: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.5
  • 5.5
  • 2.0
  • 3.0

24: 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 valve that controls the crankcase oil level
  • float type valve that controls the amount of refrigerant stored in the receiver
  • float type switch that stops the compressor when the pressure on the high side becomes too high

25: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 3/4"
  • 1/2"
  • 3/8"
  • 5/8"