Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Dry bulb temperature
  • Saturated temperature
  • Critical temperature
  • Wet bulb temperature

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

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

3: A start capacitor in series with a start winding will

  • increase the amp draw of the motor
  • increase running efficiency
  • decrease the amp draw of the motor
  • increase starting torque

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

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

5: A hissing noise at the expansion valve is a good indication that

  • nothing is passing thru
  • gas is passing thru it
  • liquid is passing thru it
  • expansion valve is oversized

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

  • voltage.
  • resistance
  • capacitance
  • amperage

7: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 9F
  • 11F
  • 29F
  • 21F

8: The best way to detect ammonia in brine is

  • CO2 gas
  • potassium of line
  • carbonation of soda
  • nessler regaent

9: A relief valve discharge capacity is rated in

  • temperature minus pounds of air per second divided by release rate squared
  • PSIG
  • PSIA
  • Pounds of air per minute.

10: What is an egress?

  • An escape route
  • A code violation
  • A valve put on the low side of the system to prevent frosting
  • An entrance or exit

11: 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?

  • CFM and HP decrease
  • CFM and HP increase
  • RPM and CFM increase
  • CFM and RPM decrease

12: A thermometer inside a duct measures ____ heat.

  • hidden
  • specific
  • latent
  • sensible

13: "E" represents _____ in the Watt's law formula.

  • watts
  • voltage
  • reactance
  • amperage

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

  • 45
  • 60
  • 38
  • 66

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

  • relief valve
  • condenser
  • service valve
  • bleed valve

16: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 32F
  • 70F
  • 58F
  • 77F

17: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

18: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

19: 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, pressure, and dipstick
  • sight glass, weight, paper method, and frost line.

20: 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

  • splurge
  • merge
  • purge
  • surge

21: How are safety controls wired in a circuit?

  • Series/parallel
  • Parallel
  • Either series or parallel
  • Series

22: What refrigerant doesn't have to be classified?

  • R-134A
  • R-422A
  • R-717
  • R-718

23: "I" represents _______ in the Watt's law formula.

  • reactance
  • watts
  • amperage
  • voltage

24: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • True
  • depends on the type of refrigerant being used
  • False

25: All serviceable components of a refrigeration system shall be provided with

  • service manuals
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • manufactures instructions on start-up procedures
  • safe access