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.Management Sciences
Category: Metallurgy
In Base metal alloys, Corrosion resistance occurs due to___________________?
A. Passivity
B. High Fusion Temperature
C. High Molecular Weight
D. Co-efficient of Thermal Expansion
Suck back porosity in the casting can be eliminated by________________?
A. Increasing the mould metal temperature difference
B. Increasing the flow of molten metal
C. Flaring the point of the sprue attachment
D. All of the above
Which of the waxes are derived from the lignite_________________?
A. Paraffin wax
B. Inlay wax
C. Microcrystalline wax
D. Montan wax
The function of a sprue is to_______________?
A. Form an opening of molten metal to enter the mold
B. Help polish cast restorations
C. Eliminate air bubbles on the wax pattern
D. Reproduce fine detail
In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
A. High gold
B. Low gold
C. Palladium – Ag
D. Ni – Cr
The main form of iron carbide found in 18-8 steel________________?
A. Martensite
B. Ferrite
C. Austenite
D. Pearlite
The most commonly used Titanium alloy for dental and medical purposes is________________?
A. Ti 6Al 4V
B. Ti 5Al 4V
C. Ti 5Al 5V
D. Ti 6Al 6V
Casting flux is used to_______________?
A. Prevent the oxidation of the metal during melting
B. increase the melting point of the flux
C. Flaring the point of the sprue attachment
D. None of the above
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