Answer / priyankar talukdar

The essential steps in winemaking can be summarized as follows:
 Extract the flavor and aroma from the base ingredients by chopping, crushing, pressing, boiling or soaking them.
 Add sugar, acid, nutrients, and yeast to the fermentation media or liquor to achieve the proper ratio and ferment, covered, for 3 to 10 days in a primary fermentation vessel (crock, jar or polyethylene pail) at 70-75 degrees Fahrenheit.
 Strain off the liquid from the pulp, put it (the liquid) into a secondary fermentation vessel (a carboy or jug), fit a fermentation trap (airlock) on the mouth of the bottle, and allow fermentation to proceed at 60-65 degrees Fahrenheit until all bubbling ceases (after several weeks).
 Siphon the wine off the sediments (lees) into another clean secondary fermentation vessel. Reattach the fermentation trap. Repeat after another one or two months and again before bottling.
 When wine is clear and all fermentation has stopped, siphon into wine bottles and cork the bottles securely. Leave corked bottles upright for 3-5 days and then store them on their side at 55 degrees Fahrenheit for six months (white wine) to a year (red wine) before sampling. If not up to expectations, allow to age another year or more.

Answer / nanda kumar

In specification with grape wine first the grapes are
squashed into mash and then little yeast is added into it
and it is left for a minimum time at a specific temperature
for bacterial decomposition where yeast acts as a bacterial
catalyst and the chemical reaction converts it into grape
wine.

POLYMER ENGINEERING - QUESTION 24.1 : The molecular weights M in kg / mol of 3 different monomers a, b and c in a polymer are Ma = 14, Mb = 16 and Mc = 18. The fraction of polymer chain X of 3 different monomers a, b and c in a polymer are Xa = 0.5, Xb = 0.3 and Xc = 0.2. (i) Calculate number average molecular weight by using the formula Ma Xa + Mb Xb + Mc Xc. (ii) Calculate weight average molecular weight by using the formula (Ma Xa Ma + Mb Xb Mb + Mc Xc Mc) / (Ma Xa + Mb Xb + Mc Xc). (iii) Calculate the polydispersity by using the answer in (ii) divided by answer in (i). (iv) If the molecular weight of repeat unit is 12, calculate the degree of polymerization by using the formula (Ma Xa + Mb Xb + Mc Xc) / (molecular weight of repeat unit).

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