Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated
  • is a self-contained complete factory made and tested system
  • is on where brine is cooled & circulated to the space refrigerated

2: Direct systems using Group II refrigerants

  • shall not be used for air condition for human comfort
  • shall be allowed to be used for human comfort.
  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms

3: Heat transferred by conduction from one body to another is done

  • via heat rays
  • via radiation
  • via liquids
  • via solids

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

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

5: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is a system highly likely to leak from a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area

6: 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
  • pick up voltage
  • lift voltage

7: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • phosgene gas sening
  • A group sensing
  • refrigerant sensing
  • CO Sensing

8: 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

9: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the comrpessor
  • start the fan and circulating pump
  • reset the expansion valve
  • reset the safety valve

10: The principle used in continuous type absorption systems is

  • Charles's Law
  • Dalton's Law
  • Boyle's Law
  • Ohm's Law

11: A capacitor in series with the start windings will do what?

  • Increase run efficiency by 10% of its rating
  • Nothing
  • Decrease the RLA to within 10% of its rating
  • Increase starting torque

12: An oil pressure safety switch should be set at

  • 10 to 15 psi below low side pressure
  • 5 to 10 psi below low side pressure
  • 5 to 10 psi above low side pressure
  • 10-15 psi above low side pressure

13: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will thicken
  • oil level will rise
  • oil will foam

14: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 99%
  • 75%
  • 90%

15: Which oil is hydoscopic?

  • mineral
  • polyolester
  • SW30
  • animal

16: Lithium-bromide, Li-Br, is best characterized as a

  • sand
  • soil
  • sugar
  • salt

17: Dew point is

  • the temperature of air of 50% RH
  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate

18: The generator shell contains the

  • condenser and the generator
  • condenser, the evaporator, and the generator
  • evaporator and the absorber
  • condenser and the absorber

19: What are the three components of a transformer?

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

20: What does safe access mean?

  • Locked doors
  • A clear unobstructed path to the equipment and controls
  • OSHA approved
  • Well-lit exit signs

21: Refrigerant restricted in 2004 but used for transition for decades:

  • R-123
  • R-22
  • R-134A
  • R-11

22: 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 installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed

23: The best way to determine the voltage requirement for an electrical component is to

  • check with the utility company
  • read the voltage with a mulitmeter
  • determine the capacity of the service panel
  • read the nameplate data

24: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

25: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • post-rotational guide vanes
  • pre-rotational guide vanes
  • check valves