In Base metal alloys, Corrosion resistance occurs due to___________________?

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. Crucible indicated for casting base metal alloys is______________?

   A. Carbon crucible
   B. Clay crucible
   C. Quartz crucible
   D. High melting plastic crucible

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

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

4. 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

5. The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?

   A. 55
   B. 65
   C. 75
   D. 85

6. Coefficient of thermal expansion of metal-ceramic alloys is________________?

   A. Same as porcelain
   B. More than porcelain
   C. Less than porcelain
   D. More than or equal to porcelain but not less

7. Corrosion of stainless steel is due to formulation of_________________?

   A. Chromium carbide
   B. Carbon carbide
   C. Iron carbide
   D. Nickel carbide

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

   A. 11.5-12.5×10-6/°C
   B. 10.5-11.5×10-6/°C
   C. 13.5-14.5×10-6/°C
   D. 16.5-17.5×10-6/°C

9. Advantage of titanium over other base metal alloys_______________?

   A. Low weight
   B. Low cost
   C. Low strength
   D. Low melting point

10. Cleaning of base metal alloy is done by______________?

    A. Warm HCI
    B. Cold HF
    C. Cold H2SO4
    D. Sand blasting with aluminium oxide