Polymer Technology Which of the following is not an elastomer? Neoprene Nitrile-butadiene Polyisoprene None of these Neoprene Nitrile-butadiene Polyisoprene None of these ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer? Polyester Polythene Nylon-6 Bakelite (phenol formaldehyde) Polyester Polythene Nylon-6 Bakelite (phenol formaldehyde) ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to Reduce the time of vulcanisation and quantity of vulcanising agent Increase its viscosity Reduce its viscosity to permit easier processing Protect rubber goods from attack by oxygen & ozone present in the atmosphere Reduce the time of vulcanisation and quantity of vulcanising agent Increase its viscosity Reduce its viscosity to permit easier processing Protect rubber goods from attack by oxygen & ozone present in the atmosphere ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Polypropylene is preferred to polythene, because the former is Non-inflammable Both B & C Harder Stronger Non-inflammable Both B & C Harder Stronger ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800? 49200 51600 50800 50000 49200 51600 50800 50000 ANSWER DOWNLOAD EXAMIANS APP
Polymer Technology Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser? Stearic acid estors Esters of phthalic acid Tricresyl phosphate Ethylene glycol Stearic acid estors Esters of phthalic acid Tricresyl phosphate Ethylene glycol ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS