Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Mercury was used in thermometers primarily because it

  • was inexpensive
  • vaporizes at very high temperatures
  • expands uniformly
  • never freezes

2: R-717 is

  • trichloromethane
  • carbon dioxide
  • ammonia
  • water

3: The two float-type metering devices are the

  • high-side float and the low-side float
  • liquid float and the vapor float
  • liquid float and the low-side float
  • vapor float and the low-side float.

4: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • place sign, check for leaks, insulate
  • you can't change refrigerants
  • make sure it's compatible, notify owner, notify A.H.J
  • nothing must be done

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

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

6: E = I X R is

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

7: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

8: Give an example of a secondary coolant?

  • R-717
  • R-718
  • R-410A
  • R-12

9: Transformers are rated in

  • amps
  • volts-ohms
  • volt-amps
  • volts

10: The low pressure oil safety switch

  • resets itself after the time delay has terminated
  • resets itself automatically
  • never trips
  • must be reset manually

11: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

12: Ohm's Law indicates Amps X Resistance = ___________.

  • Volts
  • Ohms
  • Current
  • Impedance

13: 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?

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

14: Halogenated refrigerants cannot be used with what material?

  • Copper
  • Stainless steel
  • Magnesium alloy
  • Aluminum

15: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

16: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, paper method, and frost line.
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and frost line

17: Pressure is equivalent of

  • Force X Area
  • Force / Area
  • Force
  • Area X Force

18: How many groups of refrigerants are there?

  • 1
  • 7
  • 5
  • 3

19: The certificate of inspection

  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be authorized by a notarized insurance company
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted and protected from dirt, water, and other elements

20: No open flames are allowed in the machinery room unless?

  • Only when combustion air is provided from outside of the machinery room
  • Approved by the installing contractor
  • Approved by the authorized person
  • Never can be allowed

21: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 5 amps
  • 10 amps
  • 15 amps
  • 20 amps

22: A moisture indicator must

  • be yellow
  • be sight side up
  • change color when exposed to moisture
  • be filled with liquid

23: Large mercantile occupancy is

  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.

24: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

25: A class B1 refrigerant is considered

  • non-toxic but highly flammable
  • toxic and somewhat flammable
  • toxic but non-flammable
  • non-toxic and non-flammable