Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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.
  • commercial occupancy
  • business occupancy

2: What is the state of the refrigerant leaving the evaporator?

  • a high temperature superheated vapor
  • a low temperature subcooled liquid
  • a high temperature subcooled liquid
  • low temperature superheated vapor

3: What is Trichlorotrifluoromethane?

  • R-12
  • R-113
  • R-13
  • R-11

4: Which occupancy can ammonia be used in?

  • commercial
  • depends on the quantity of freon
  • redifential
  • industrial

5: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 24,000 BTU
  • 144 BTU
  • 970 BTU
  • 12,000 BTU

6: What type of oil is used in R-410A systems?

  • naphthene
  • polyolester (POE)
  • mineral oil
  • polyalkylene glycol (PAG)

7: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

8: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • hold up to 110% of the pumpdown charge
  • release the charge when the pressure exceeds 310 psig or higher
  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • receive the pumpdown charge

9: On a single phase motor, when does the start winding cut out?

  • Start windings do no cut-out of the run cycle
  • At 25% of its full rated speed
  • At 75% of its full rated speed
  • At 50% of its full rated speed

10: Cooling tower lowers condenser water temp by

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

11: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • magnesium
  • black iron
  • stainless steel

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

13: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • increased capacity
  • low suction pressure
  • low pressure chillers do not have purge units
  • high head pressure

14: What is the minimum height refrigeration piping should be placed against walls?

  • Ceiling height
  • 6'
  • 7.25'
  • 72"

15: Stop valves shall not be permitted between the system and the

  • condenser
  • bleed valve
  • relief valve
  • service valve

16: The leaving chilled water set point for comfort cooling is typically?

  • 45
  • 60
  • 38
  • 66

17: Control systems can be classified by

  • economy of operation
  • tonnage of system
  • safety
  • source of power

18: What is not a requirement of a class T machine room?

  • fire hose connection to the building fire protection system
  • self-closing doors
  • tight fitting doors
  • automatic ventilation

19: 1 Watt = ______ BTU's?

  • 7.216
  • 12
  • 3.412
  • 4.482

20: 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
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and dipstick

21: Mercury was used in thermometers primarily because it

  • never freezes
  • was inexpensive
  • expands uniformly
  • vaporizes at very high temperatures

22: Who authorizes changes to the safety codes?

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

23: What is the purpose of a surge capacitor on a contactor?

  • to keep the contactor pulled in
  • to balance the sine waves
  • to protect low voltage equipment
  • to provide smoother start/stops

24: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

25: Each machinery room shall contain

  • high and low pressure controls
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate