Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Direct systems using Group II refrigerants

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

3: A device used to measure small pressure differences is the

  • phsycometirc
  • manometer
  • pyrometer
  • anemometer

4: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • B-2
  • A-2
  • B-1

5: 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

6: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's water
  • Because it's a non-flammable refrigerant
  • Because it's cheap

7: Which occupancy can ammonia be used in?

  • industrial
  • commercial
  • depends on the quantity of freon
  • redifential

8: What is an egress?

  • An escape route
  • An entrance or exit
  • A code violation
  • A valve put on the low side of the system to prevent frosting

9: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device and a pressure relief valve installed
  • does not require a pressure-limiting device
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device installed on the high side of the system

10: Bubbles in the liquid line sight glass could be caused by

  • plugged drier
  • bad low pressure switch
  • overcharge of oil
  • leaking discharge valves in the compressor

11: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • first disconnect in
  • breaker panel in
  • load-side of the contactor in
  • 24 volt secondary side of the Class 2 transformer to the thermostat

12: A self contained system

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

13: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 66
  • 38
  • 45

14: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

15: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

16: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 3.0, 3.5
  • 2.5, 2.5
  • 6.6, 6.6
  • 2.5, 3.0

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

  • bleed valve
  • relief valve
  • service valve
  • condenser

18: The measurement of heat in a particular substance is

  • latent heat
  • enthalpy
  • sensible heat
  • specific heat

19: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 24
  • 18
  • 10
  • 15

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

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

21: A Low-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection will enter the occupied space

22: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 15 uf
  • 40 uf
  • 20 uf
  • 25 uf

23: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

24: 746 watts is equal to

  • 1 hp
  • 10 hp
  • Pi
  • 100 hp

25: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 75%
  • 80%
  • 90%
  • 99%