Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

2: Name a CFC refrigerant(s):

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

3: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

4: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% tap water
  • 40% Li-Br, 60% distilled water
  • 50% Li-Br, 50% tap water

5: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • CO Sensing
  • A group sensing
  • phosgene gas sening
  • refrigerant sensing

6: A start capacitor is wired in _____ with the start windings.

  • parallel
  • series-parallel
  • junction
  • series

7: How are refrigerant blends classified?

  • Based on worst case fractionation
  • Blends don't have to be classified
  • Based on the oil used
  • Based on best case Fractionation

8: Where is the high-side float located on a chiller system?

  • flash line
  • liquid line
  • inside the chiller barrel
  • discharge line

9: The Board of Boilers adopts by reference

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

10: Brazed joints melt at temperatures above

  • 1,200F
  • 1,000F
  • 800F
  • 500F

11: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • relief plug
  • fusion plug
  • rupture plug
  • fusible plug

12: Liquid level gauges must be provided with what?

  • A low level mark
  • A red line
  • Automatic shut-offs
  • A relief valve

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

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

14: 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
  • surge
  • purge

15: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 20
  • 50
  • 15
  • 75

16: What device should be used on low-temperature freezers?

  • oil separator
  • discharge muffler
  • hot-gas by-pass
  • high capacity TXV

17: A self contained system

  • is a complete factory made and tested system
  • is a unit system Group II refrigerants only
  • is a unit system Group I refrigerants only
  • is any system or part of a system used to increase evaporation by expansion or vaporization

18: Pi equals approximately

  • 3.41
  • 746
  • 12,000
  • 3.14

19: What is the leaving chilled water set point for water chiller systems?

  • 45F
  • 66F
  • 55F
  • 38F

20: What section of ASHRAE-15 governs pressure vessels?

  • Section 6 ASHRAE-34 ASME VIII unfired
  • Section 9 ASHRAE-15 ASME VIII unfired
  • Section 7 ASHRAE-15 ASME VIII fired
  • OSHA

21: E = I X R is

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

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

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

23: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

24: 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

25: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above