Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

2: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 1,000
  • 110
  • 330
  • 6.6

3: The two basic types of evaporators are

  • direct expansion and plate
  • finned and plate
  • prime surface and finned
  • flooded and direct expansion

4: Which refrigerant is lighter than air?

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

5: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated
  • is a self-contained complete factory made and tested system

6: What refrigerant doesn't have to be classifted?

  • R-717
  • R-711
  • R-718
  • R-134a

7: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 48
  • 36
  • 18
  • 24

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

  • Large mercantile
  • Place of assembly
  • Instituional
  • Industrial

9: 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
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall be prohibited

10: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 70.8 psig
  • 43.3 psig
  • 66.1 psig
  • 50.2 psig

11: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • Section 8 ASHREA 15 ASME unfired
  • OSHA
  • Section ASHREA 34

12: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

13: At higher altitudes, boiling temperatures

  • are unaffected
  • depends on the refrigerant
  • decrease
  • increase

14: 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.

15: The measurement of heat in a particular substance is

  • enthalpy
  • sensible heat
  • latent heat
  • specific heat

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

  • Scroll
  • Screw
  • Reciprocating
  • Centrifugal

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

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

18: 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

19: Before replacing a seized compressor, the _______ should be determinded.

  • type of refrigerant
  • designed head pressure
  • cause of seizure
  • current draw

20: What is not a requirement of a Class T machine room?

  • Automatic ventilation
  • Fire hose connected to the building fire protection system.
  • Tight fitting doors
  • Self-closing doors

21: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • explosion precautions must be taken
  • gas masks must be worn
  • no flames shall be permitted
  • the owner shall be informed

22: Heat is a form of

  • energy
  • power
  • matter
  • work

23: How many gallons of water do you need per pound of ammonia?

  • 10
  • 1
  • 100
  • 50

24: A self contained system

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

25: Viscosity is

  • the ability of oil to flow
  • a measure of heat content
  • measure of weight
  • the coefficient of external friction