12 Questions
What is the purpose of using the correct ratio of oxygen to acetylene in oxy-acetylene flame?
To avoid carbon pick-up by the alloy
In electric melting, what is the role of the water-cooled coil?
To prevent self-melting of the coil during the process
Which zone of the flame of a blowtorch is responsible for oxidizing the alloy?
Combustion zone
Why is it recommended to use twice the amount of gold required for the framework during casting preparation?
To create a denser sprue as a reservoir
What is the average weight range of a mandibular partial denture casting in terms of gold weight?
$14$ to $16$ dwt
What are the three purposes served by the burnout operation?
Drive off moisture, vaporize the pattern, expand the mold
Why should the torch be removed simultaneously when releasing the casting machine in gold casting?
To prevent over-heating and destruction of gold alloy components
What are the two techniques used to remove the wax?
Slow technique and Rapid technique
Which type of casting machine uses gas oxygen blowtorch as a heating source?
Air pressure machine
What happens if too little force is used in the casting process?
Mold is not completely filled
Why is it important to eliminate all traces of wax from the mold in the burnout process?
To prevent entrapment of gases in the casting
In the context of casting machines, what does 'induction method' provide?
A rapid and accurate method of melting the metal
Test your knowledge about burnout and casting techniques in the manufacturing process. Learn about the process of removing wax from a mold using heat and the purposes of the burnout operation. Explore different techniques for eliminating wax and optimizing the casting process.
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