84301. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
84302. The arithmetic average of 10 numbers is If one is added to each number,by how much would the average increase?
84303. Inconel contains
84304. In a hardening process, the hypo-eutectoid steel is
84305. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
84306. Which of the following statement is incorrect about duralumin?
84307. The property of a material which enables it to retain the deformation permanently, is called
84308. Sulphur in cast iron
84309. Cementite consist of
84310. Cast iron is a ductile material.
84311. Manganese is added in low carbon steel to
84312. Beryllium bronze contains
84313. The portion of the blast furnace below its widest cross-section is called
84314. Gamma-iron occurs between the temperature range of
84315. When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.
84316. According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is
84317. Wrought iron
84318. In iron, the presence of carbon in free form is called graphite.
84319. In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.
84320. Which of the following is a case hardening process?
84321. In a crystalline material, atoms are arranged in definite and orderly manner and form.
84322. The austenitic stainless steel contains
84323. The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is
84324. Steel containing upto 0.15% carbon, is known as
84325. In a unit cell of a body centred cubic space lattice, there are __________ atoms.
84326. What is the sum of n terms of the series 2+4+6+-------?
84327. The nuts and bolts are made from silicon steel.
84328. Silicon in cast iron
84329. The process which improves the machinability of steels, but lowers the hardness and tensile strength, is
84330. Which of the following iron exists at 910° C?
84331. The iron ore mostly used for the production of pig iron is
84332. A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
84333. The steel widely used for making precision measuring instruments is
84334. The ductility is the property of a material due to which it
84335. The high speed steel has __________ percentage of tungsten.
84336. The essential constituent of a hardened steel is
84337. The cutting tools are made from
84338. The maximum solubility of carbon in austenite is 1.7% at 1130° C.
84339. In a close packed hexagonal space lattice, there are
84340. Iron-carbon alloys containing 4.3% carbon are known as hypo-eutectic cast irons.
84341. The approximate height of a blast furnace is
84342. A steel alloy containing 36% nickel is called
84343. The addition of manganese to aluminium improves corrosion resistance.
84344. The temperature point at which the change ends on heating the steel is called
84345. The malleability is the property of a material due to which it can be rolled or hammered into thin sheets.
84346. The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.
84347. Which of the following solids are malleable and ductile?
84348. The delta-iron possesses a body centred cubic space lattice.
84349. Thermosetting plastics are those materials which
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