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While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
According to the structure of the polymer, it is classified into- Linear polymers Branched-chain polymers Cross-linked or network polymers Co-polymers
Thermosetting polymers as compared to thermoplastic polymers
Low quality of jute fibre is attributed to
1. Discoloration of fibre
2. Very short fibre strands
3. Reduction of cellulose in fibre
4. Reduction of cell wall strength over-retting decreases the fibre quality due to
Select the correct answer:
 With respect to the Thermosetting Polymers, mark the correct statements It consists of highly cross-linked polymer chains. They are brittle in nature Bakelite is the example of thermosetting polymers These are synthesized by condensation polymerization.
A glass fibre reinforced epoxy composite is made with 60 wt.% unidirectional continuous glass fibres. The elastic moduli of the glass fibre and the epoxy matrix are 72.5 and 2.4 GPa, respectively. What is the elastic modulus of this composite along the fibre direction, in GPa? The densities of glass fibre and epoxy are 2.58 g/cm3 and 1.14 g/cm3, respectively
Paper making polymers can be categorized as naturally occurring polymers, modified naturally occurring polymers, and synthetic polymers.
A supervised analysis refers to classification of data into a set of predefined categories. For example, depending on the purpose of the experiment, the data can be classified into predefined ‘diseased’ or ‘normal’ categories.
Which one of the following statement is/are incorrect with respect to fibre intake in animals? 1. Forage dry matter consumption should be near 2% of the body weight. 2. At least 21-25% acid detergent fibre should be in the total ration. 3. At least 28-30% neutral detergent fibre should be in the total ration. 4. Provide at least 3 Kg of fibre a day.
Consider the following statements.
1. Fibre optics is based on the principle of total internal reflection.
2. In an optical fibre communication system, power consumption is extremely low
3. Optical fibre communications are free from radio frequency interference.
4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre.
Which of these statements are correct?