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HVAC 100 Midterm Rev

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

 



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