A. Increase the strength
B. Counter balance contraction of gypsum during heating
C. aid in hygroscopic expansion
D. Increase the shelf life of investment
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Related Mcqs:
- Gypsum bonded investment should not be heated over______________?
- A. 700°C B. 1,300°C C. 1,063°C D. 900°C...
- The best pickling solution for gypsum bonded investment is_______________?
- A. Hydrochloric acid B. Nitric acid C. Sulphuric acid D. Phosphoric acid...
- 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...
- Quartz in investment material is added for_______________?
- A. Strength B. Expansion components for casting shrinkage C. Decrease strength D. Contraction...
- 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...
- 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...
- Binder used in Gypsum investment is_________________?
- A. Silica B. Quartz C. Cristobolite D. Calcium sulphate monohydrate...
- The strength of a gypsum investment is dependent on_______________?
- A. Carbon content B. Silica content C. Gypsum D. Copper...
- Modiffiers are added to gypsum mainly to_______________?
- A. Modify setting time B. Modify setting expansion C. Modify strength D. Decrease the porosity...
- Lenolin is added is ZOE paste to______________?
- A. Decrease flow B. Increase flow C. Accelerate reaction D. Decrease irritation due to eugenol...
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