Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • gas
  • liquid
  • solid
  • All of the above

2: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 38
  • 88
  • 58
  • 96

3: When an inspection is needed, how often must it be done?

  • annually
  • every 36 months
  • every 18 months
  • every 24 months

4: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

5: The most common type of motor starter is

  • delts-wye starter
  • across the line starter
  • duel-winding starter
  • part winding starter

6: Absolute pressure is

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

7: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 10 amps
  • 24 amps
  • 20 amps
  • There isn't enough information to answer.

8: What instrument is used to measure very high resistance?

  • ammeter
  • voltmeter
  • tape measure
  • meg ohmmeter

9: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

10: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • of Group B2 refrigerant shall be prohibited
  • shall not be prohibited
  • shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited

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

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

12: Humidity can be sensed with

  • bimetal
  • human hair
  • pressure bellows
  • thermometer

13: What is the amp draw of a 40 VA transformer at 24 volts

  • 1,000 amps
  • 106 amps
  • 1K amps
  • 1.6 amps

14: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • immersion controller
  • low voltage t-stat
  • aquastat
  • line voltage t-stat

15: 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
  • hold up to 110% of the pumpdown charge
  • receive the pumpdown charge

16: Which refrigerant is lighter than air?

  • R-717
  • R-123
  • R-11
  • R-134a

17: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

18: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

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

  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • 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-length of fittings

20: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

21: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • high side of the system
  • the vapor side of the system
  • low side of the system
  • the liquid side of the system

22: Direct systems using Group II refrigerants

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

23: Single compound Refrigerants are classified by what two criteria?

  • Temperature range and hazardousness
  • Flammability and toxicity
  • Weight and color
  • Flammability and temperature range

24: Fractionation occurs when

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

25: Gauge pressure is

  • Force of pressure above that of atmosphere
  • Atmospheric pressure
  • Barometric pressure
  • Absolute pressrue