Principles of Heat, Gas Laws, and Basic HVAC Electrical Concepts

University:
University of Louisiana at Lafayette
Course:
ENGR 301 | Thermodynamics
Academic year:

2022
Views:

76

Pages:

2
Author:

folclord7m

Question The human body gives off heat by which of the following: a.) Covection b.) Radiation c.) Conduction d.) All of the above The standard atmospheric pressure at sea level is? As the temperature of a material increases, the molecules in the material ____? The amount of heat needed to change the temperature of a substance will vary with the type of substance. This heat quality is called the ____ of the substance. If the temperature remains constant and the volume that the gas occupies increases, the pressure will ____? The volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. This is called ___? At a constant pressure, the volume of gas varies as to the absolute temperature and at a constant volume the pressure of the gas varies directly with the absolute temperature. This is known as ____? The proper type of flame from an oxy-acetylene torch for silver brazing is? For cleaning ACR copper tubing before soldering, a material that can be used is: Molten solder flows between the two base metals being soldered because of? Which of the following represents the lowest vacuum? To pull a vacuum means to: A compound gauge: a.) Indicates pressures above 14.696 psia b.) Indicates pressures in inches Hg below atmospheric pressure c.) Is one of two gauges on a typical gauge manifold d.) All of the above A micron gauge is used to measure Noncondensable gases The unit used to measure electrical power is One watt of electrical energy is equal to How many watts of electrical power are equal to 1 horsepower? A vapor material exerts a pressure or force The size indicated for the diameter of L type copper tubing used for plumbing is the approx. Brazing is done at ____ soldering Filler materials used in the connection of copper joints are composed of? When soldering or brazing, the solder is? To insure accurate testing, the best material to use for connecting lines to the vacuum pump amd gauge set is? A multiple evacuation means that ___ Moisture in a liquid state must be ____ before it can be removed with a vacuum pump. Which of rhe following refrigerants is a CFC-type refrigerant? Which of the following is an example of an HCFC refrigerant? Which of the following is HFC- type refrigerant? Which type of refrigerant has the HIGHEST Ozone Depletion Potential (ODP)? The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is? To reprocess refrigerant to meet new product specifications is called? Answer All of the above 29.92" Hg Travel faster Specific heat Decrease Boyle's Law Charle's Law A neutral flame Sand Cloth Capillary Action 1000 microns Lower the pressure in a refrigeration system below atmospheric All of the above Absolute pressures below 1mm Hg Are undesirable in a refrigeration system Watts 3.413 Btu 746 In all directions Inside dimension Higher temperatures than 15% to 60% silver Melted by heat from the tubing and fitting Copper tube You pull a vacuum on a refrigeration system more than once, allpwing refrigerant or nitrogen into the system between each procedure. Vaporized R-12 R-22 R-134a CFC HFC Reclaim To clean refrigerant by the use of filter dryers is called? To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called? Recycle Recovery

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