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- 1. Multiple Choice
Gypsum produced as a by-product of flue gas
desulfurization
decalcification
saphonification
dechlorinatiom
- 2. Multiple Choice
The resulting particle is a fibrous aggregate of fine crystals with capillary pores known as
plaster of Paris
Dental stone
Die stone
all
- 3. Multiple Choice
When gypsum is heated in a kettle, vat, or rotary kiln that maintains a wet environment; a crystalline hemihydrate called
dental stone
dental plaster
plaster of paris
Die stone
- 4. Multiple Choice
α-hemihydrate β-hemihydrate • Formed when dihydrate is heated under
compressed air
steam pressure
Vaccum
free oxygen
- 5. Multiple Choice
Set gypsum products probably never attain 100% conversion unless they are exposed to
low humidity
high humidity
no humidity
room temperature
- 6. Multiple Choice
The colloidal theory proposes that, when mixed with water, hemihydrate enters into the colloidal state through a ________mechanism.
sol-gel
gel-gel
sol-sol
all
- 7. Multiple Choice
The hydration theory suggests that rehydrated plaster particles unite through ___________ bonding with sulfate groups to form the set material.
Covalent
hydrogen
oxygen
double
- 8. Multiple Choice
The tests done for setting of gypsum products are listed as below EXCEPT
Loss of gloss test.
Gillmore’s test
Vicat test
Meltons test
- 9. Multiple Choice
Increasing or decreasing the rate of crystal growth will accelerate or retard the
mixing time
setting time
working time
curing time
- 10. Multiple Choice
The most commonly used accelerator is
potassium nitrate
potassium oxide
potassium sulfate
zinc
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