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.Management Sciences
Category: Metallurgy
Solder and flux used for joining Elgiloy wires are_____________?
A. Gold solder and borax flux
B. Gold solder and fluoride flux
C. Silver Solder and borax flux
D. Silver solder and fluoride flux
Waxes are used for_______________?
A. Primary impression
B. Corrective impressions
C. Impression of single tooth
D. None of the above
Binder in phosphate bonded investment is______________?
A. Magnesium oxide & Phosphate
B. Magnesium oxide & Phosphoric acid
C. Magnesium oxide & Monoammonium phosphate
D. Magnesium oxide & Ortho Phosphoric acid
Which of the following is correct________________?
A. Type I and Type II gold can be heat treated and annealed
B. Type III and Type IV gold can be heat treated and annealed
C. Type I and IV gold can be heat treated and annealed
D. All the type of gold can be heat treated and annealed
Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?
A. Chromium
B. Indium
C. Irridium
D. Palladium
The main ingredient of inlay wax is__________________?
A. Candellila wax
B. Paraffin wax
C. Carnauba wax
D. Gum dammar
Function of carnauba wax_________________?
A. To provide a smooth and glossy surface
B. Increase toughness
C. Decrease toughness
D. Decrease flow at room temperature
In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?
A. Improve bonding
B. Decrease porosity
C. They react with the porcelain opaque layer, which masks the metal
D. Improves the thermal expansion between the metal and porcelain
A common electrolyte used for plating copper indirect dies is_______________?
A. Copper cynide
B. Ionic copper
C. Acidic copper sulfate
D. Silver cyanide
Addition of large amounts of platinum to a casting gold alloy will________________?
A. Decrease its strength and ability to be hardened
B. Decrease its tarnish resistance
C. Increase its fusion temperature
D. Redden the alloy
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