Bissoy.com
Doctors Medicines MCQs Q&A

In the Shell Core making, when the sand blowing is employed, it is preferred to use resin precoated sands to avoid resin segregation.

In the Shell Core making, when the sand blowing is employed, it is preferred to use resin precoated sands to avoid resin segregation. Correct Answer True

In shell core making, the sand is mixed with about 2% to 5% thermosetting resin of phenolic type is either dumped or blown and then when the sand blowing is carried out, resin precoated sand is preferred to impart high permeability and smooth surfaces.

Related Questions

In core blowing machines, the filling of core sands in core boxes is done by using compressed air.
In the question below are given three statements followed by four conclusions numbered I, II, III, IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the following conclusions logically follows from the given statements disregarding commonly known facts. Statements: All sands are golds. No silver is a gold. Some silvers are leads. Conclusions: I) No sand is a gold. II) Some leads are not golds. III) Some sands are silvers. IV) Some leads are sand.
The sand carrying the compressed air stream in the core blowing machine is responsible for filling the core box and ramming the core.
Resin P, on further heating turns into completely cross-linked resin Q, which is totally insoluble and infusible. Resin P is slightly heat fusible and insoluble in alkalis and alcohols but partly soluble in acetone. What are the names of resin P and Q?
Which of the following statements are correct pertaining to the value of uniformity coefficient Cu for filter sand? (1) For slow sand filters, Cu = 1.8 to 2.5 (2) For rapid sand filters, Cu = 1.3 to 1.7 (3) For slow sand filters, Cu = 1.3 to 1.7 (4) For rapid sand filters, Cu = 1.8 to 2.5
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 filtersSelect your answer based on the coding system given below:
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:
Inorganic type of core binders is generally preferred as compared to organic core binders in core making procedure.
The permeability of core sand is generally kept higher as compared to that of moulding sand in core making operation.
Statement: Syrian President Bashar al-Assad has revealed during an interview that a direct clash between the US and Russia in Syria was narrowly avoided "by the wisdom of the Russian leadership".  Which of the following objection(s) might be a probable reason(s) for such a revelation by Syrian President Bashar al-Assad? I. Adding that Syria needs Russian support, Assad said, "At the same time we need to avoid the American foolishness in order to be able to stabilise our country". II. Adding that Syria needs American support, Assad said, "At the same time we need to avoid the American foolishness in order to be able to stabilise our country". III. Adding that Syria needs Russian support, Assad said, "At the same time we need to avoid the Russian foolishness in order to be able to stabilise our country". IV. Adding that Syria needs American support, Assad said, "At the same time we need to avoid the Russian foolishness in order to be able to stabilise our country".