Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

3: Fractionation occurs when

  • the pressures decreases as the heat load decreases
  • the pressures increase as the heat load increases
  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • when a fraction of refrigerant is added as the full charge

4: The first step in mechanical refrigeration is

  • condensation
  • expansion
  • compression
  • evaporation

5: What is a Category "M" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperatures over 366F

6: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe as you would measure it
  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe plus equivalent of fittings multiplied by 2.31

7: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

8: Suction line oil traps should be installed when the condenser is

  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator
  • in the basement and the evaporator is on the third floor
  • on the third floor roof and the evaporator is in the basement

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

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

10: In a motor, an internal overload might open if

  • there's an open start winding
  • there's an excess current draw through the motor
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's a direct short

11: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 14 AWG
  • 12 AWG

12: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 3/32"
  • 1/16"
  • 1/8"

13: Dew point is

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

14: 746 watts is equal to

  • 10 hp
  • 100 hp
  • 1 hp
  • Pi

15: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 20
  • 15
  • 10
  • 25

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

  • 100
  • 50
  • 1
  • 10

17: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested

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

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

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

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

20: How many refrigerant classifications are there for toxicity?

  • 5
  • 3
  • 1
  • 2

21: A movie theater would be considered a

  • institutional occupancy
  • mixed occupancy
  • commercial occupancy
  • public assembly occupancy

22: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

23: Watt's Law indicates Volts X Amps = _________.

  • Resistance
  • Current
  • Watts
  • Ohms

24: "I" represents ____ in the Ohm's law formula.

  • resistance
  • amperage
  • capacitance
  • voltage.

25: Relief valves are rated in

  • pounds of air per hour
  • pounds of air per minute
  • gallons of water per hour
  • gallons of water per minute