Impurities in casting is removed by________________?
A. Annealing
B. Degassing
C. Pickling
D. Conditioning
Metallurgy
Shape memory is seen in________________?
Shape memory is seen in________________?
A. Stainless steel wire
B. NITTINOL wire
C. TMA wire
D. Aluminium
The best pickling solution for gypsum bonded investment is_______________?
The best pickling solution for gypsum bonded investment is_______________?
A. Hydrochloric acid
B. Nitric acid
C. Sulphuric acid
D. Phosphoric acid
Corrosion of stainless steel is due to formulation of_________________?
Corrosion of stainless steel is due to formulation of_________________?
A. Chromium carbide
B. Carbon carbide
C. Iron carbide
D. Nickel carbide
The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
A. Recovery stage
B. Recrystallisation stage
C. Grain growth stage
D. All of the above
Which one of the following categories of dental materials has the highest thermal conductivity_________________?
Which one of the following categories of dental materials has the highest thermal conductivity_________________?
A. Unfilled acrylic plastics
B. Gold alloys
C. Porcelains
D. Zinc phosphate cements
Most biocompatible material in oral cavity is_______________?
Most biocompatible material in oral cavity is_______________?
A. Platinium
B. Palladium
C. Titanium
D. Gold
Which of the waxes are derived from the lignite_________________?
Which of the waxes are derived from the lignite_________________?
A. Paraffin wax
B. Inlay wax
C. Microcrystalline wax
D. Montan wax
Silver plated dyes use an electrolytic bath of_______________?
Silver plated dyes use an electrolytic bath of_______________?
A. Silver fluorides
B. Silver cyanide
C. Silver bromide
D. Silver iodide
Suck back porosity is due to_________________?
Suck back porosity is due to_________________?
A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature