Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Muffler
  • Foot valve
  • Moisture indicator

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

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

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

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

4: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

5: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 277v
  • 208v
  • 240v
  • 120v

6: When using nitrogen for brazing, the pressure should be:

  • Very low
  • Slightly below atmospheric
  • 125 psig
  • 50-100 psig

7: The principle used in continuous type absorption systems is

  • Charles's Law
  • Boyle's Law
  • Ohm's Law
  • Dalton's Law

8: What would be the classification for Stop & Shop grocery store?

  • Place of assembly
  • Large mercantile
  • Industrial
  • Instituional

9: How many refrigerant classifications are there for flammability?

  • 1
  • 2
  • 3
  • 7

10: Most CFC's are

  • flammable
  • toxic
  • inert
  • inert but toxic

11: Refrigerants shall be classified by

  • maximum permissible quantities of each group
  • color codes
  • toxicity and flammability
  • requirements for commercial, industrial, and residential occupancies

12: What is used to check very low air pressures in air conditioning duct?

  • Manometer
  • Vacuum gauge
  • Anemomter
  • Barometer

13: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Pressure induced displacement.
  • Positive displacement
  • Low Pressure displacement
  • Non-positive displacement

14: The color code of a tank of ammonia is

  • white
  • light green
  • silver
  • lavender

15: Fractionation occurs when

  • 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
  • the pressures increase as the heat load increases
  • the pressures decreases as the heat load decreases

16: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • concentrated solution
  • absorbed solution
  • weak solution
  • strong solution

17: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

18: R22 and 410A operate at the same range of condensing and evaporating temperatures

  • true
  • false

19: B3 refrigerants are considered

  • toxic and highly flammable
  • non-toxic but flammable
  • non-toxic but non-flammable
  • toxic but non-flammable

20: Halo-carbon refrigerants cannot be used with what material?

  • Copper
  • Stainless Steel
  • Magnesium alloy
  • Aluminum

21: An oil pressure safety switch should be set at

  • 10 to 15 psi below low side pressure
  • 5 to 10 psi above low side pressure
  • 5 to 10 psi below low side pressure
  • 10-15 psi above low side pressure

22: Ammonia (NH3) is a group III refrigerant

  • True
  • False

23: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

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

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

25: The Board of Boilers adopts by reference

  • Montreal Protocol Safety Code
  • the 1997 ANSI/ASHRAE Safety Code
  • the MACS Pressure Vessel Code of Massachusetts
  • MSCA Code