Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is potential measured in?

  • Volts
  • Henrys
  • Ohms
  • Amps

2: Heat is a form of

  • matter
  • work
  • energy
  • power

3: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 970 BTU
  • 144 BTU
  • 24,000 BTU
  • 12,000 BTU

4: On a TXV, the purpose of an external equalizer is to?

  • allow a greater adjustment spam
  • balance the evaporator load
  • Increase the pressure on the top of the power head diaphragm
  • compensate for a pressure drop across the evaporator coil

5: What is a Category "D" fluid?

  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • A typical refrigerant used on newer air conditioning and heat pump ssytems

6: Humidity can be sensed with

  • pressure bellows
  • human hair
  • thermometer
  • bimetal

7: R-11 belongs to Group

  • B-3
  • B-1
  • A-1
  • A-2

8: 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

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

  • A-1
  • C-3
  • A-3
  • B-2

10: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 365 psig
  • 327 psig
  • 255 psig
  • 125 psig

11: _____ and its alloys are suitable for use with ammonia systems.

  • Copper
  • Aluminum
  • Magnesium
  • Zinc

12: What section governs pressure vessels?

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

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

  • Aluminum
  • Copper
  • PVC
  • Stainless Steel

14: A class B2 refrigerant is considered

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

15: The two float-type metering devices are the

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

16: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 80%
  • 90%
  • 100%
  • 75%

17: What type refrigerant is NOT ozone depleting?

  • Halon
  • CFC
  • HFC
  • HCFC

18: A micron is

  • one millonths of a micrometer
  • one millonths of a centimeter
  • one thousandths of a millimeter
  • a larger unit of measurement than Hg

19: What is the state of the refrigerant leaving the evaporator?

  • low temperature superheated vapor
  • a high temperature subcooled liquid
  • a high temperature superheated vapor
  • a low temperature subcooled liquid

20: What is a Category "M" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • Any fluid that exceeds 150 psig and has design temperatures over 366F

21: The low pressure oil safety switch

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

22: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • Low head pressure and high suction pressure
  • High head pressure and low suction pressure
  • High suction pressure and high discharge pressure.
  • Low suction pressure and low discharge pressure

23: How much refrigerant can be stored in a mechanical room outside of the system?

  • 330
  • 200
  • 100
  • 150

24: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • low side of the system
  • the liquid side of the system
  • high side of the system
  • the vapor side of the system

25: It takes how many BTU/hr to melt one pound of ice at 32F

  • 970
  • 180
  • 212
  • 144