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_______________?

Related Mcqs:

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

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

2. The most commonly used accelerator in gypsum product is___________________?

   A. Sodium fluoride
   B. Potassium fluoride
   C. Potassium sulfate
   D. Aluminium sulfate

3. The function of 2% potassium sulphate in a gypsum product is_____________?

   A. To regulate the setting expansion
   B. Regulate setting time
   C. Acts as retarder
   D. None

4. Type I gypsum product is also called_______________?

   A. Impression plaster
   B. Class I stone / Hydrocal
   C. Class II stone/Densite
   D. Model plaster

5. Gypsum product having least expansion_____________?

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

6. Steam under pressure in used in ________ sterilization?

   A. Pasteurization
   B. Autoclave
   C. Kochs sterilizer
   D. hot air oven

7. Modiffiers are added to gypsum mainly to_______________?

   A. Modify setting time
   B. Modify setting expansion
   C. Modify strength
   D. Decrease the porosity

8. ADA specification number of gypsum products are described under____________?

   A. 1
   B. 4
   C. 12
   D. 25

9. As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?

   A. 0.05
   B. 0.10
   C. 0.15
   D. 0.20

10. The setting expansion of gypsum products can be reduced by________________?

    A. Increased spatulation
    B. Adding potassium sulfate
    C. Less water powder ratio
    D. Allowing setting under water