Which of the following is correct________________?

Related Mcqs:

1. 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

2. Which of the following refractory is used to counteract most of the expansion________________?

   A. Quartz
   B. Cristobalite
   C. Tridymite
   D. Corundum

3. Which of the following is function of fluoride flux in soldering process ?

   A. It prevents the formation of copper oxide
   B. It prevents the formation of chromium oxide or dissolves chromic oxide layer
   C. It prevents the flow of material in undesirable area
   D. Increase the strength of solder

4. Which one of the following elements is NOT added is small amount to be used as grain refiners ?

   A. Iridium
   B. Ruthinium
   C. Indium
   D. Platinum

5. Which of the following increases castability of base metal alloys________________?

   A. Tin
   B. Beryllium
   C. Molybdenum
   D. Carbon

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

   A. Propane
   B. Acetylene
   C. Natural gas
   D. Hydrogen

7. Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?

   A. Type I – Soft
   B. Type II – Hard
   C. Type III – Hard
   D. Type IV – Extra Hard

8. Which of the following decrease with strain hardening______________?

   A. Surface hardness
   B. Strength
   C. Proportion limit
   D. Corrosion resistance

9. Which one of the following is most elastic ?

   A. a titanium
   B. B titanium
   C. Chrome-cobalt-nickel
   D. Nickel-titanium

10. Which of the following zones is used for melting alloy during casting______________?

    A. Reducing flame
    B. Oxidizing flame
    C. Green flame
    D. All of the above