Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection can not enter the occupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system

2: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

3: What measures gas pressure?

  • Hygrometer
  • Manometer
  • Barometer
  • Hydrometer

4: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

5: What device measures the specific gravity of a substance?

  • Hydrometer
  • Manometer
  • Hygrometer
  • Thermometer

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

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

7: A pressure relief should be located at least _______ from windows and doors.

  • 15'
  • 20'
  • 30'
  • 25'

8: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Isothermal
  • Adiabatic
  • Pressure Temperature

9: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UV”
  • “UL”
  • “U” or “UM”

10: "P" represents ______ in the Watt's law formula

  • watts
  • voltage
  • reactance
  • amperage

11: Name a reason that does not cause reduced condenser air quantity

  • High ambient temperature
  • Dirty fan blades
  • Dirty Coil
  • Prevailing winds

12: How many volts would you read on a 480V system phase to phase?

  • 480
  • 1/3 the voltage
  • 277

13: RPM's of a centrifugal compressor are at approximately?

  • 500
  • 10,000
  • 15,000
  • 30,000

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

  • true
  • false

15: 1 HP = ____ Watts?

  • 3,412
  • 11,239
  • 3.1416
  • 746

16: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • green
  • red
  • blue
  • orange

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

  • relief valve
  • bleed valve
  • service valve
  • condenser

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

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

19: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

20: A mercury bulb controller is not recommended for

  • use where vibration is severe
  • low voltage use
  • line or low voltage use
  • line voltage use

21: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

22: On a centrifugal compressor, stationary diffuser vanes are needed to

  • stop gas flow
  • prevent high pressure on the packing
  • convert velocity energy to pressure
  • increase the clearance space

23: Which refrigerant class listed below is the most flammable?

  • A-3
  • C-3
  • B-2
  • A-1

24: Which creates more of a heat load?

  • 50% RH
  • 30% RH
  • 70% RH
  • 90% RH

25: Class A refrigerants are considered

  • flammable
  • toxic
  • non-toxic
  • non-flammable