A. Increased spatulation
B. Adding potassium sulfate
C. Less water powder ratio
D. Allowing setting under water
Related Mcqs:
- 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 - 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 - Setting expansion is advantageous in__________________?
A. Casts
B. Models
C. Investment
D. Dies - 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 - ADA specification number of gypsum products are described under____________?
A. 1
B. 4
C. 12
D. 25 - 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 - The strength of gypsum prouducts is generally expressed in terms of______________?
A. Tensile strength
B. Wet strength
C. Green strength
D. compressive strength - Type III Dental gypsum is__________________?
A. Class II stone
B. Densite
C. Class I stone or hydrocal
D. Model or lab plaster - Gypsum is used for________________?
A. Impressions
B. Casts
C. Die
D. Casts and Dies - Gypsum product having least expansion_____________?
A. Impression plaster
B. Model plaster
C. Stone plaster
D. Die stone
