Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What are the three components of a transformer?

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

2: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • mercantile occupancy
  • public assembly occupancy.
  • business occupancy
  • commercial occupancy

3: 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

4: Name a CFC refrigerant(s):

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

5: How far from the window does a relief valve need to be according to ASHRAE-15?

  • There is no minimum for relief valve and windows.
  • At least 40'
  • At least 30'
  • At least 20'

6: 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

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

  • 120v
  • 240v
  • 208v
  • 277v

8: How many flammability classifications are refrigerants in?

  • 7
  • 2
  • 3
  • 5

9: When the compressor is below the condensor

  • traps are not needed on this type of system
  • traps are needed on the discharge line
  • traps are needed on the suction line
  • traps are needed on the oil return line

10: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

11: A Low-Probability System

  • 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 will enter the occupied space
  • 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 can not enter the occupied space

12: Clearance volume

  • affects compressor capacity
  • varies depending on compressor speed
  • is the same on all compressors
  • has no effect on compressor capacity

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: NH3 is

  • lithium bromide
  • R-508A
  • ammonia
  • R-718

15: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

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

  • 1
  • 50
  • 10
  • 100

17: R-12 is

  • dichloromethane
  • dichlorodifluoromethane
  • trichlorofluoromethane
  • dichlorofluoromethane

18: one BTU equals

  • Pi
  • 31.4 hp
  • 3.41 hp
  • 12,000 hp

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

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

20: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

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

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

22: A micron is

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

23: The main purpose of the accumulator is to

  • provide space for vapor to accumulate
  • store liquid refrigerant
  • provide space for the accumulation of oil and containminants
  • prevent liquid slugs at the compressor

24: Increasing superheat will do what to your system?

  • Decrease liquid flow
  • Increase liquid flow
  • Nothing
  • Increase gas flow

25: 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