Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Humidity can be sensed with

  • bimetal
  • thermometer
  • human hair
  • pressure bellows

2: Which creates more of a heat load?

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

3: What is the purpose of a surge capacitor on a contactor?

  • to protect low voltage equipment
  • to keep the contactor pulled in
  • to balance the sine waves
  • to provide smoother start/stops

4: The boiling point of a refrigerant is based on

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

5: Ammonia vaporization takes place at what temperature?

  • -32F
  • -460F
  • -110F
  • -28F

6: Most CFC's are

  • inert but toxic
  • flammable
  • toxic
  • inert

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

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

8: What is not a requirement of a class T machine room?

  • tight fitting doors
  • self-closing doors
  • automatic ventilation
  • fire hose connection to the building fire protection system

9: What is the maximum voltage range allowed on an electrical circuit?

  • 10%
  • 15%
  • 20%
  • 5%

10: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • outside the machinery room
  • evaporator
  • compressor

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

  • bleed valve
  • relief valve
  • condenser
  • service valve

12: Where must a refrigeration contractor's license number be displayed?

  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.
  • Truck, office, every job, and on all equipment
  • Trucks, license plates, and uniforms

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

  • Current
  • Watts
  • Resistance
  • Ohms

14: How many refrigerant classifications are there for flammability?

  • 1
  • 7
  • 2
  • 3

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

  • refractometer
  • Psychrometer
  • hydrometer
  • anemometer

16: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

17: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 13.9 lbs
  • 6.6 lbs
  • 44 lbs

18: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • boost voltage
  • pick up voltage
  • run voltage
  • lift voltage

19: E = I X R is

  • Watts Law
  • Ohms Law
  • Amps Law
  • Impedance Law

20: Increasing superheat will do what to your frost line?

  • Could either increase or decrease depending on the load conditions
  • Nothing
  • Increasae
  • Decrease

21: Low pressure chiller systems use what type of compressor?

  • Centrifugal
  • Scroll
  • Screw
  • Reciprocating

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

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

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

  • 58F
  • 77F
  • 70F
  • 32F

24: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 80%
  • 90%
  • 75%

25: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 100,000
  • 10,000
  • 100
  • 1,000