84351. The percentage of phosphorus is phosphor bronze is
84352. In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.
84353. For the pipe fitting like elbow, tee, union etc., which of the following is preferred?
84354. Chilled cast iron is produced
84355. Silicon is added in low carbon steels to
84356. According to Indian standard specifications, cast iron designated by 'FG 150' means
84357. The red flame during the operation of a bessemer converter indicates that the
84358. Phosphor bronze has
84359. In the austempering process of heat treatment, austenite changes into
84360. Which of the following material has maximum malleability?
84361. Nichrome contains more iron than Inconel.
84362. Hardness of steel is increased by adding sulphur, lead and phosphorus.
84363. If a2+b2=25 and ab=12,then (a+b)/a-b is:
84364. The machine tool guide ways are usually hardened by
84365. Monel metal contains
84366. A fine grained steel
84367. Babbit metal contains
84368. A steel with 0.8% carbon is known as
84369. When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of
84370. In the middle part of the blast furnace (zone of absorption), the temperature is
84371. The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.
84372. The temperature point at which the change starts on heating the steel is called
84373. Aluminium bronze has high resistance to corrosion.
84374. Manganese bronze contains more copper than silicon bronze.
84375. In a face centred cubic space lattice, there are
84376. The fuel used in a blast furnace is
84377. Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.
84378. Which of the following is a point imperfection?
84379. The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as
84380. The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.
84381. Muntz metal (Yellow brass) contains
84382. Which of the following gives the correct order of increasing hot hardness of cutting tool materials?
84383. The slag from the blast furnace
84384. Which of the following is a mesomorphous material?
84385. The casting ability of aluminium increases when __________ is added to aluminium.
84386. Manganese bronze has
84387. A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as
84388. Silicon bronze contains
84389. In acidic bessemer process, the furnace is lined with
84390. The malleability is the property of a material by virtue of which a material
84391. The area of the largest circle that can be drawn inside a rectangle with 8 cm by 7 cm is (take Pie=22/7)
84392. Duplex process of steel making is a combination of
84393. In corrosion resistant properties, bronzes are __________ to brasses.
84394. Steel containing 0.8 to 1.5% carbon, is known as
84395. Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation.
84396. The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is
84397. The portion of the blast furnace above its widest cross-section is called
84398. The phosphorus and sulphur in steel making can be removed by using basic bessemer process.
84399. The heat treatment process used for castings is
84400. Micro-structure of a material is, generally, examined by
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