Dental Materials MCQs

Page No. 44

Dendrites in cst alloys form by mechanism of_________________?


aConstitutional superconductivity

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bConstitutional supercooling

✓


cConstitutional supergritting

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dConstitutional supergraining

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Microstructure of cobalt chromium alloy in cast condition is______________?


aFibrous

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bHomogenous

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cInhomogenous

✓


dAmorphous

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View Answer Inhomogenous

Component of inlay wax which makes it flake resistant is_____________?


aParaffin

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bCarnauba

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cGum dammar

✓


dCanadelila

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View Answer Gum dammar

Advantage of titanium over other base metal alloys_______________?


aLow weight

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bLow cost

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cLow strength

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dLow melting point

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View Answer Low weight

Nickel-Titanium alloy has__________________?


aUnreliable spring back

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bLow spring back

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cMinimal spring back

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dNone of the above

✓


View Answer None of the above

Binder used in Gypsum investment is_________________?


aQuartz

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bSilica

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cCristobolite

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dCalcium sulphate monohydrate

✓



The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?


aCarbon

✓


bMolybdenum

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cNickel

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dchromium

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View Answer Carbon

Suck back porosity in the casting can be eliminated by________________?


aIncreasing the mould metal temperature difference

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bIncreasing the flow of molten metal

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cFlaring the point of the sprue attachment

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dAll of the above

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Which of the following decrease with strain hardening______________?


aProportional limit

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bStrength

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cSurface hardness

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dCorrosion resistance

✓


View Answer Corrosion resistance

Asbestos liner is used in a casting ring to________________?


aFacilitate venting of the mold

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bRetard the heating of the investment

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cPermit expansion of the world

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dAll of the above

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