In core making operation, core sand without binder and moisture is used to increase hardness.

In core making operation, core sand without binder and moisture is used to increase hardness. Correct Answer False

In the core making process, core sand is used which is also known as oil sand. It is high rich silica sand that blends with oil binders such as core oil which is a combination of linseed oil, resin, mineral oil and other bind substances. Flours and water can also be used in making of large cores which is a very economical way.
Bissoy MCQ

Related Questions

In core sand preparation, roller mills are suitable for core sand that contains only a single binder called cereal binders.
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
The permeability of core sand is generally kept higher as compared to that of moulding sand in core making operation.
A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)
200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maximum equilibrium moisture?
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).
The process of coating the aggregates with the binder is largely controlled by ______ of the binder.
Cleaning is done by
(i) Scraping and removal in filters slow sand
(ii) Back washing in slow sand filters
(iii) Scraping and removal in filters rapid sand
(iv) Back washing in rapid sand filters
The correct answer is
The binder commonly used in making oil sand, is