Incomplete casting is the result of_____________?

Related Mcqs:

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

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

2. Flux is used during casting to________________?

   A. Remove the oxides formed on the gold alloy
   B. Lower the melting point
   C. Replace casting wax
   D. Speed the burnout process

3. Glossy smooth margins of a casting are due to_____________?

   A. Shrinkage of alloy on cooling
   B. Investment breakdown
   C. Incomplete wax elimination
   D. Incomplete gas elimination

4. Crucible indicated for casting base metal alloys is______________?

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

5. Casting flux is used to_______________?

   A. Prevent the oxidation of the metal during melting
   B. increase the melting point of the flux
   C. Flaring the point of the sprue attachment
   D. None of the above

6. Function of wetting agents used in casting procedure is_________________?

   A. To felicitate wetting of ring liner
   B. To felicitate mixing investment
   C. To reduce contact angle of liquid with max surface
   D. For better wax elimination

7. 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

8. Suck back porosity in the casting can be eliminated by________________?

   A. Increasing the mould metal temperature difference
   B. Increasing the flow of molten metal
   C. Flaring the point of the sprue attachment
   D. All of the above

9. Impurities in casting is removed by________________?

   A. Annealing
   B. Degassing
   C. Pickling
   D. Conditioning

10. Which zone is the hottest and efficient burning zone of the flame used for casting ?

    A. Oxidizing zone
    B. Reducing zone
    C. Combustion zone
    D. None of the above