Setting expansion is advantageous in__________________? A. Casts B. ModelsC. Investment D. Dies

Back pressure porosity can be avoided by________________? A. Using asbestos linearB. Placing the sprue at least one quarter inch away form the end of casting ring C. Preventing rapid heating the investment in burnout oven D. Using a short and…

Which of the following zones is used for melting alloy during casting______________? A. Reducing flame B. Oxidizing flame C. Green flame D. All of the above

Cleaning of base metal alloy is done by______________? A. Warm HCI B. Cold HF C. Cold H2SO4D. Sand blasting with aluminium oxide

Which one of the following is most elastic ? A. a titanium B. B titanium C. Chrome-cobalt-nickelD. Nickel-titanium

A thinner mix of a gypsum bonded investment will_______________? A. Produce a smoother castingB. Decrease setting expansion C. Increase setting expansion D. Increase thermal expansion

Stainless steel orthodontic wire can be hardened by________________? A. TemperingB. Work hardening C. Age hardening D. Precipitation hardening

Pickling________________? A. Is accomplished by soaking the casting in baking soda B. Causes porosity in goldC. Removes surface oxides from gold castings D. Remove investment from gold casting

NiTi alloy have_______________? A. Shape memory B. Hyper rigidity C. Corrosion resistance D. Weldable properties

The main form of iron carbide found in 18-8 steel________________? A. Martensite B. FerriteC. Austenite D. Pearlite