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Q1. Describe the roles of fillers, plasticizers and stabilizers in polymer processing.

Q2. A sphere of 100 mm diameter is to be coated with the chromium from a solution having chromium in the six valent (hexavalent) state.  How much time would be required to produce a coating 20 µm thick if:

a) Current is 20 A.

b) The cathodic efficiency is 15%.

Atomic weight and density of chromium are 52 and 7.2 gcm–3 correspondingly.

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  • Category:- Physics
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