Dental Materials MCQs

Page No. 42

The solvent flux used for base metal soldering is_______________?


aBoric acid

✖


bBorax

✓


cFluoride

✖


dRouge

✖


View Answer Borax

In Base metal alloys, Corrosion resistance occurs due to___________________?


aPassivity

✓


bHigh Fusion Temperature

✖


cHigh Molecular Weight

✖


dCo-efficient of Thermal Expansion

✖


View Answer Passivity

The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?


aMore

✖


bLess

✓


cEqual

✖


dDepends on the alloy type

✖


View Answer Less

Fins and spines on the casting is seen due to_______________?


aRapid heating

✓


bProlonged heating

✖


cWater film contamination

✖


dToo high pressure during casting

✖


View Answer Rapid heating

Solder and flux used for joining Elgiloy wires are_____________?


aGold solder and borax flux

✖


bGold solder and fluoride flux

✖


cSilver solder and borax flux

✖


dSilver solder and fluoride flux

✓



Which of the following fuel gases is the best choice of heat source to carry out soldering process ?


aPropane

✓


bAcetylene

✖


cNatural gas

✖


dHydrogen

✖


View Answer Propane

The best fuel gas when used with oxygen is______________?


aHydrogen

✖


bNatural gas

✖


cPropane

✓


dAcetylene

✖


View Answer Propane

Annealing is also known as_______________?


aSoft heat treatment

✖


bHaed heat treatment

✖


cPrecipitating heat treatment

✖


dStress relieving heat treatment

✓



Quartz is added to gypsum bonded investment to______________?


aIncrease the strength

✖


bCounter balance contraction of gypsum during heating

✓


caid in hygroscopic expansion

✖


dIncrease the shelf life of investment

✖



Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?


a11.5-12.5×10-6/°C

✖


b10.5-11.5×10-6/°C

✖


c13.5-14.5×10-6/°C

✓


d16.5-17.5×10-6/°C

✖


View Answer 13.5-14.5×10-6/°C

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