Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: 1 HP = ____ Watts?

  • 3,412
  • 11,239
  • 3.1416
  • 746

3: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 45F
  • 158F
  • 32F
  • 155F

4: R-123 belongs to Group

  • A-3
  • B-2
  • B-1
  • B-3

5: 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.

6: Most CFC's are

  • toxic
  • flammable
  • inert but toxic
  • inert

7: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

8: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 226 psig, 68 psig
  • 257 psig, 77 psig
  • 365 psig, 120 psig
  • 455 psig, 185 psig.

9: A High-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 will enter an unoccupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system

10: Pipe identification labels are required when the system contains more than

  • 65 lbs
  • 120 lbs
  • 55 lbs
  • 110 lbs

11: What type of material can't be used on the outlet of a relief valve?

  • Stainless steel
  • Magnesium alloy
  • Copper
  • PVC

12: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 240v
  • 277v
  • 120v
  • 208v

13: What type of copper is not permitted on refrigeration systems?

  • Type K
  • Type L
  • Type N
  • Type M

14: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • stainless steel
  • magnesium
  • black iron

15: A hotel is considered a _______ occupancy.

  • institutional
  • commercial
  • mercantile
  • residential

16: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • there is no Group B1 refrigerants
  • the same
  • higher
  • lower

17: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

18: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

19: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

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

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

21: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

22: The purpose of an accumulator is to

  • filter out impurities from the system
  • store excess refrigerant from the reciver
  • assure no liquid returns to the compressor
  • reduce friction loss to the flow of refrigerant

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

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

24: Usually dry bulb temperature is

  • higher than wet bulb temperature
  • lower than dry bulb temperature
  • not important and shall be ignored
  • same as wet bulb temperature

25: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • low suction pressure
  • high head pressure
  • increased capacity