A. Carbon content
B. Silica content
C. Gypsum
D. Copper
Related Mcqs:
- 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 - Gypsum bonded investment should not be heated over______________?
A. 700°C
B. 1,300°C
C. 1,063°C
D. 900°C - 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 - Binder used in Gypsum investment is_________________?
A. Silica
B. Quartz
C. Cristobolite
D. Calcium sulphate monohydrate - 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 - The strength of gypsum prouducts is generally expressed in terms of______________?
A. Tensile strength
B. Wet strength
C. Green strength
D. compressive strength - 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 - Materials which has high compressive strength and low tensile strength is classified with property of________________?
A. Ductility
B. Brittleness
C. Malleability
D. Resilient - ADA specification number of gypsum products are described under____________?
A. 1
B. 4
C. 12
D. 25
