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You Are On Multi Choice Question Bank SET 466

23301. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of

23302. Lavatory cisterns are normally made of

23303. In soldering aluminium cables with a ferrule joint it is advisable to use

23304. Cellulose is the main contituent of most __________ fibres.

23305. __________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine.

23306. __________ tubes are good substitude for human blood vessels onrheart by-pass operation.

23307. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?

23308. Automobile steering wheels are normally made of

23309. 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 ?

23310. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.

23311. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.

23312. Which of the following low molecular weight (<104 ), soft & waxy polymer is used in chewing gum ?

23313. Buna-S is a __________ material.

23314. Zeigler - Natta catalyst (AlR3 - AlCl3) is used in the polymerisation of

23315. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of

23316. The distance between clips in horizontal runs shall not exeed

23317. The main use of butadiene is

23318. Mastication of rubber means

23319. For pipe earthing the minimum internal diameter of galvanized iron or steel pipe required is

23320. Reaction of dimethyl terephthalate (DMT) and ethylene glycol produces

23321. Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.

23322. Density of high density polythene is about __________ gm/c.c.

23323. Vinyl flooring is done using __________ sheets.

23324. Thiokol is nothing but

23325. Transistor parts and refrigerator components are normally made of

23326. Dacron (or terylene) fibres as compared to nylon fibres have

23327. Orlan fibre which is used as a wool sub stitute is

23328. According to I.E rules the leakage current in an installation should not exceed one by --------th part of the maximum current supplied to the installation

23329. Trade name of __________ is neoprene.

23330. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at

23331. The conductors of the armature windings are soldered at the commulator

23332. Starting material for the production of SBR is

23333. Which of the following is a copolymer ?

23334. Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its

23335. The organic acid monomer in nylon 66 is

23336. Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is

23337. The synthetic fibres produced from __________ are known as rayon.

23338. Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to

23339. Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.

23340. Which of the following is generally not used as eord for synthetic rubber tyre casing ?

23341. __________ is not a polyester fibre.

23342. Nitrile rubber is produced by the polymerisation of

23343. Celluloid is

23344. Styrene butadiene rubber (SBR) as compared to natural rubber has

23345. Which of the following polymers has the tendency of decomposing before melting ?

23346. Which of the following polymers belong to the class of formaldehyde resin ?

23347. Nylon 6 as compared to nylon 6, 6 has lower

23348. Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?

23349. __________ is an addition polymer

23350. Branched chair polymers as compared to linear polymers have

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