Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: An accumulator can be located between the

  • first stage and second stage compressors
  • compressor and condenser
  • evaporator and compressor
  • condenser and evaporator

2: A water regulating valve opens when

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

3: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

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

4: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • store excess refrigerant from the reciver
  • filter out impurities from the system
  • reduce friction loss to the flow of refrigerant

5: On a pumpdown system, the liquid-line solenoid is controlled by the

  • thermostat
  • low pressure switch
  • defrost timer
  • low-ambient controller

6: Doors communicating with outside from a mechanical room must be?

  • Steel, approved, weather-stripped
  • Self-closing, approved, fire door
  • Self-closing, aligned, fire door
  • Self-closing, wooden, fire door

7: R-22 falls under which safety classification?

  • A-1
  • B-1
  • A-2
  • B-2

8: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

9: 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

10: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Cascade
  • Low pressure
  • Simple
  • R-414B

11: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 22
  • 18
  • 33
  • 50

12: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • refractometer
  • anemometer
  • hydrometer
  • Psychrometer

13: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • purge
  • surge
  • splurge
  • merge

14: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 75
  • 50
  • 100
  • 24

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

  • 45
  • 60
  • 38
  • 66

16: Which of the following is an inorganic refrigerant?

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

17: A mixed occupancy occurs when two or more occupancies are located with the same building

  • true
  • false

18: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

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

  • 208v
  • 120v
  • 240v
  • 277v

20: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

21: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

22: What section governs pressure vessels?

  • Section 8 ASHREA 15 ASME unfired
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA

23: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 90
  • 100
  • 80
  • 110

24: Machinery rooms must be vented to ______?

  • neutralizing tank
  • basement
  • outdoors
  • unoccupied spaces

25: Sensible heat is the heat added to a substance to

  • cause evaporation
  • change its state
  • raise its temperature
  • freeze it