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

Related Mcqs:

1. 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

2. Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?

   A. 18.6ml
   B. 22.2ml
   C. 30.4ml
   D. 45.3ml

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

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

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. Which is gypsum product_______________?

   A. Stone
   B. Plaster
   C. Investment
   D. All of the above

7. The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?

   A. They are more regular in shape and dense
   B. They are more regular in shape and highly porous
   C. They are more irregular in shape and porous
   D. They are more dense and prismatic in shape

8. The strength of gypsum prouducts is generally expressed in terms of______________?

   A. Tensile strength
   B. Wet strength
   C. Green strength
   D. compressive strength

9. The strength of the gypsum specimen when the water in excess of that required for the hydrate of the hemihydrate is left in the specimen is called____________?

   A. Dry strength
   B. Green strength
   C. Water strength
   D. Compressive strength

10. Gypsum is used for________________?

    A. Impressions
    B. Casts
    C. Die
    D. Casts and Dies