Binder used in Gypsum investment is_________________?

Related Mcqs:

1. Binder in phosphate bonded investment is______________?

   A. Magnesium oxide & Phosphate
   B. Magnesium oxide & Phosphoric acid
   C. Magnesium oxide & Monoammonium phosphate
   D. Magnesium oxide & Ortho Phosphoric acid

2. The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?

   A. Alpha – hemihydrates
   B. Beta – hemihydrates
   C. Calcium sulphate dihydrate
   D. Orthorhombic anhydrate

3. Gypsum bonded investment should not be heated over______________?

   A. 700°C
   B. 1,300°C
   C. 1,063°C
   D. 900°C

4. Quartz is added to gypsum bonded investment to______________?

   A. Increase the strength
   B. Counter balance contraction of gypsum during heating
   C. aid in hygroscopic expansion
   D. Increase the shelf life of investment

5. The best pickling solution for gypsum bonded investment is_______________?

   A. Hydrochloric acid
   B. Nitric acid
   C. Sulphuric acid
   D. Phosphoric acid

6. The strength of a gypsum investment is dependent on_______________?

   A. Carbon content
   B. Silica content
   C. Gypsum
   D. Copper

7. A thinner mix of a gypsum bonded investment will_______________?

   A. Produce a smoother casting
   B. Decrease setting expansion
   C. Increase setting expansion
   D. Increase thermal expansion

8. Accelerators and retarders are used with gypsum products mainly to control_______________?

   A. Setting time
   B. Setting expansion
   C. Hardness of the set product
   D. None of the above

9. Type III Dental gypsum is__________________?

   A. Class II stone
   B. Densite
   C. Class I stone or hydrocal
   D. Model or lab plaster

10. Gypsum product having least expansion_____________?

    A. Impression plaster
    B. Model plaster
    C. Stone plaster
    D. Die stone