A. Is accomplished by soaking the casting in baking soda
B. Causes porosity in gold
C. Removes surface oxides from gold castings
D. Remove investment from gold casting
Related Mcqs:
- Flux is used during casting to________________?
A. Remove the oxides formed on the gold alloy
B. Lower the melting point
C. Replace casting wax
D. Speed the burnout process - The yield strength of AUstenite (NiTi alloy) is______________?
A. 100 Mpa
B. 240 Mpa
C. 560 Mpa
D. 700 Mpa - The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?
A. Pinhole porosity
B. Gas inclusion porosity
C. Micro porosity
D. Subsurface porosity - Quartz in investment material is added for_______________?
A. Strength
B. Expansion components for casting shrinkage
C. Decrease strength
D. Contraction - The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
A. 0%
B. 2 to 3%
C. 5 to 10%
D. <1% - The solvent flux used for base metal soldering is_______________?
A. Boric acid
A. Borax
B. Fluoride
C. Rouge - 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 - Silver plated dyes use an electrolytic bath of_______________?
A. Silver fluorides
B. Silver cyanide
C. Silver bromide
D. Silver iodide - Silica sol__________________?
A. Is applied to the walls of the investment to produce hygroscopic expansion
B. Increase the strength and the setting expansion of the phosphate-bonded investment
C. Acts as a retarder in the silica bonded investments
D. Acts as a refractory in the Silica bonded investments - Stainless steel orthodontic wire can be hardened by________________?
A. Tempering
B. Work hardening
C. Age hardening
D. Precipitation hardening
