Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which refrigerant class listed below is the most flammable?

  • A-1
  • A-3
  • C-3
  • B-2

2: In a motor, an internal overload might open if

  • there's an open start winding
  • there's an excess current draw through the motor
  • there's a direct short
  • there was a high pressure refrigerant was used for a low pressure system.

3: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

4: "E" references ____ in the Ohm's law formula

  • voltage
  • amperage
  • capacitance
  • resistance

5: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?

  • Water and soap
  • Oil and water
  • Air and dirt
  • Moisture and air

6: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 9F
  • 21F
  • 29F
  • 11F

7: R-22 is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • B-1
  • B-2
  • A-2

8: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 30 days
  • 2 months
  • 14 days
  • 1 week

9: A VRF system is a direct system

  • true
  • false

10: E = I X R is

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

11: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and the solution will evaporate.

12: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 108
  • 88
  • 38

13: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the safety valve
  • start the comrpessor
  • reset the expansion valve
  • start the fan and circulating pump

14: Ammonia vaporization takes place at what temperature?

  • -110F
  • -28F
  • -460F
  • -32F

15: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

16: 746 watts is equal to

  • 1 hp
  • 100 hp
  • Pi
  • 10 hp

17: 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

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

18: When an electronic bridge is in balance the bridge output will be

  • .01 volts
  • 15 volts
  • 0 volts
  • 1 volt

19: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 5/8"
  • 3/4"
  • 3/8"
  • 1/2"

20: What section governs pressure vessels?

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

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

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

22: A Lithium-bromide system is an absorption system that

  • uses water as a refrigerant and lithium bromide as an absorbent
  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses water as a absorbent and lithium bromide as a refrigerant
  • uses ammonia as a refrigerant and lithium bromide as an absorbent

23: What do you need to do when you install a new system?

  • Add refrigerant
  • Have it inspected
  • Document the superheat and subcooling reading
  • Insulate the suction line before you take a superheat reading

24: A restaurant is classified as a

  • commercial occupancy
  • mixed occupancy
  • large mercantile occupancy
  • public assembly occupancy

25: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above