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.Management Sciences
Category: Metallurgy
Sub surface porosity can be decreased by_______________?
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A. Decreasing the sprue length
B. Decreasing the sprue thickness
C. Increasing the melting temperature
D. Increasing the mould temperature
Which one of the following elements is NOT added is small amount to be used as grain refiners ?
A. Iridium
B. Ruthinium
C. Indium
D. Platinum
Gap between true end of casting ring and wax pattern should be______________?
A. ¼ inch
B. ½ inch
C. 3/8 inch
D. one inch
Component of inlay wax which makes it flake resistant is_____________?
A. Paraffin
B. Carnauba
C. Gum dammar
D. Canadelila
Which of the following will produce the most rigid restoration for framework of same dimension ?
A. Wrought alloy
B. Palladium alloys
C. Cobalt-chrome alloys
D. Partial denture casting gold in hardened condition
NiTi alloy have_______________?
A. Shape memory
B. Hyper rigidity
C. Corrosion resistance
D. Weldable properties
Softening heat treatment of alloy increases_________________?
A. Tensile strength
B. Proportional limit
C. Ductility
D. Hardness
Shape memory in NiTi is because of stress induced form__________________?
A. Austenite to martensite
B. Martensite to austenite
C. Ferrite to austenite
D. Austenite to ferrite
Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?
A. High quality iron
B. Chrome
C. Cobalt
D. Nickel
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