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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
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:
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.
According to the structure of the polymer, it is classified into- Linear polymers Branched-chain polymers Cross-linked or network polymers Co-polymers
Paper making polymers can be categorized as naturally occurring polymers, modified naturally occurring polymers, and synthetic polymers.
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?
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
For amorphous and semi-crystalline polymers, mixing leads to the formation of ____________
Consider the following in case of high-energy forming processes: 1. The evacuation between die and blank in explosive forming is done by a vacuum pump. 2. The pressure waves produced in water in explosive forming deform the blank to the die shape. 3. The electrohydraulic forming makes use of discharge of large amount of electrical energy used in a capacitor bank. 4. In Petroforge, the piston is moved by combustion of fuel moving at the rate of 150-200 m/s. Which of the above are correct?
S1:Metals are today being replaced by polymers in many applications.
P :Above all, they are cheaper and easier to process making them a viable alternative to metals.
Q :Polymers are essentially a long chains of hydrocarbon molecules.
R :Today polymers as strong as metals have been developed.
S :These have replaced the traditional chromium-plated metallic bumpers in cars.
S6:Many Indian Institutes of science and Technology run special programmes on polymer science.

The Proper sequence should be: