Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 10 amps
  • 15 amps
  • 20 amps
  • 5 amps

2: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 1 week
  • 2 months
  • 14 days
  • 30 days

3: What are the three components of a transformer?

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

4: Low pressure systems have what kind of compressor?

  • Scroll
  • Centrifugal
  • Rotary
  • Reciprocating

5: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • run as designed with low ambient controls
  • decreases
  • doesn't change
  • increases

6: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

7: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • strong solution
  • absorbed solution
  • concentrated solution
  • weak solution

8: When air is ducted through a machine room that services occupied space, What must be done?

  • Ducted and sealed
  • Insulated and cross broke
  • Welded and seamed.
  • Flanged and gasketed

9: 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

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

10: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 226 psig, 68 psig
  • 257 psig, 77 psig
  • 455 psig, 185 psig.
  • 365 psig, 120 psig

11: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UM
  • UV or UR
  • UM or UL
  • UL and UR

12: A micron is

  • one thousandths of a millimeter
  • one millonths of a centimeter
  • a larger unit of measurement than Hg
  • one millonths of a micrometer

13: How are a compressor and condenser fan wired?

  • parallel
  • parallel-series
  • series
  • series-parallel

14: What must be done if refrigeration lines pass through a concrete floor?

  • leak checked
  • moisture barrier
  • insulated
  • installed through a pipe casing

15: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • evaporator
  • outside the machinery room
  • compressor
  • boiler

16: One atmosphere equals

  • 29.4
  • 0 psia
  • 0 psig
  • 14.7

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

  • amperage
  • voltage
  • resistance
  • capacitance

18: Gauge pressure is

  • what a gauge reads when checking pressures on a chilled water system.
  • atmospheric pressure
  • force of pressure above that of atmospheric
  • absolute pressure

19: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

20: How much clearance do you need around the perimeter of electrical panels?

  • 36"
  • 12"
  • 18"
  • 24"

21: How many volts would you read on a 480V system phase to phase?

  • 0
  • 1/3 the voltage
  • 277
  • 480

22: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use fusible plugs
  • shall use pressure relief devices

23: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

24: What section of ASHRAE-15 governs pressure vessels?

  • Section 9 ASHRAE-15 ASME VIII unfired
  • Section 6 ASHRAE-34 ASME VIII unfired
  • Section 7 ASHRAE-15 ASME VIII fired
  • OSHA

25: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above