Q. Conversion of silica mineral to cristobalite is accompanied by reduction in its

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Q. Chrome magnesite is not used in the

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Q. Which of the following bricks has the most close values of RUL and PCE ?

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Q. Silica refractories are not used in

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Q. Refractory materials are never used in the construction of

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Q. Segar cones are used for the determination of __________ of refractories.

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Q. Fireclay bricks are used in the

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Q. Carbon refractories have very high

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Q. Orlan fibre which is used as a wool sub stitute is

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Q. Neoprene is the trade name of

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Q. Trade name of __________ is neoprene.

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Q. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at

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Q. Dacron is a/an

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Q. The main use of butadiene is

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Q. Mastication of rubber means

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Q. Polymethyl methacrylate (PMMA) is known as

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Q. Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces

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Q. Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.

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Q. Which of the following low molecular weight (<10⁴ ), soft & waxy polymer is used in chewing gum ?

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Q. Buna-S is a __________ material.

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