Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • the same
  • higher
  • there is no Group B1 refrigerants
  • lower

2: Name three things that must be done when changing refrigeration lubricant?

  • Place sign, check for leaks, insulate
  • Nothing must be done
  • Make sure it's compatible, notify owner, notify AHJ
  • You can't change lubricants.

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

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

4: While the system is operating, the discharge line should be

  • at the same temperature as the crankcase
  • room temperature
  • 10-15F warmer than ambient
  • too hot to hold by hand

5: The color code of a tank of ammonia is

  • silver
  • white
  • light green
  • lavender

6: A thermometer inside a duct measures ____ heat.

  • specific
  • hidden
  • latent
  • sensible

7: Start to Run windings will have what resistance?

  • All will be at equal values
  • The most resistance value
  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value

8: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

9: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • There isn't enough information to answer.
  • 20 amps
  • 10 amps
  • 24 amps

10: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.

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

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

12: How is bring measured?

  • manometer
  • anemometer
  • hydrometer
  • hygrometer

13: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

14: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection can not enter the occupied space
  • 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 a system highly likely to leak form a failed connection or component of such system

15: A water regulating valve opens when

  • when the power is on there is an overcharge of refrigerant
  • the head pressure rises
  • the compressor is on
  • when the power is on

16: What refrigerant doesn't have to be classifted?

  • R-134a
  • R-718
  • R-717
  • R-711

17: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection
  • over pressure protection and a rupture disc
  • over pressure protection as well as a temperature protection device

18: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 20
  • 25
  • 10
  • 15

19: What are the three components of a transformer?

  • Primary coil, secondary coil, and core
  • Primary coil, secondary coil, and copper contacts
  • Contacts, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.

20: Refrigeration piping before being buried shall be

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

21: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

22: Can ammonia be used on domestic system?

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

23: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of high temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of low temperature evaporator
  • outlet of the liquid line

24: A hissing noise at the expansion valve is a good indication that

  • expansion valve is oversized
  • nothing is passing thru
  • gas is passing thru it
  • liquid is passing thru it

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

  • 1%
  • 4%
  • 2%
  • 25%