252. Which of the following finds the least commercial use ?
253. Which of the following is the most widely used insulating material for steam carray-ing pipelines ?
254. Silicon percentage in iron castings to have maximum hardness should be about
255. Nickel as a material of construction
256. __________ moulding process can not be used for thermoplastic plastics.
257. Which of the following crystal structures characterises the ferritic stainless steel ?
258. 'Semi steel' is
259. Gun metal is an alloy of
260. Carbon content in steel is __________ percent.
261. Which of the following has a very high carbide forming tendency in steels ?
262. The most distinguished property of malleable cast iron is its high
263. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.
264. Which of the following is the hardest material ?
265. Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system ?
266. Biological shield in a nuclear power reactor is made of
267. Caustic soda is transported in __________ lined containers.
268. Acid proof stoneware
269. Diamagnetic materials are magnetised
270. High degree of toughness is a must for
271. 'Hypersil' is a __________ steel.
272. __________ can replace tungsten in high speed steel,
273. Polythene (low or high density) containers are not corroded by
274. Bronze is an alloy of copper and
275. Which of the following exercises most powerful influence on the mechanical properties of steel ?