Investment material used for cobalt-chromium alloys is_____________?

Related Mcqs:

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

   A. More
   B. Less
   C. Equal
   D. Depends on the alloy type

2. Microstructure of cobalt chromium alloy in cast condition is______________?

   A. Fibrous
   B. Homogeneous
   C. Inhomogenous
   D. amorphous

3. Cobalt-Chrominum alloys contains_______________?

   A. 30% cobalt and 60% chrominum
   B. 60% cobalt and 30% chrominum
   C. 1% palladium
   D. 20% gold

4. All of the following statements about cast cobalt alloy are true EXCEPT_____________?

   A. They have a modulus of elasticity twice that of gold alloys
   B. They are more rigid than gold alloys
   C. They have higher ductility than gold alloys
   D. They have a lower proportional limit than gold alloys

5. Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?

   A. High quality iron
   B. Chrome
   C. Cobalt
   D. Nickel

6. Passivating alloys are_______________?

   A. Cr, Al, Ti
   B. Cr, Mo, Ti
   C. Cr, Gold, Ti
   D. Cr, Fe, Ti

7. The deoxidizing agent added to dental alloys is______________?

   A. Palladium
   B. Silver
   C. Copper
   D. Zinc

8. Nickel is added to wrought gold alloys as______________?

   A. Strengtherner
   B. Hardener
   C. Whitens the alloy
   D. Scavenger

9. Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?

   A. Chromium
   B. Indium
   C. Irridium
   D. Palladium

10. Dendrites in cst alloys form by mechanism of_________________?

    A. Constitutional superconductivity
    B. Constitutional supercooling
    C. Constitutional supergriting
    D. Constitutional supergraining