84151. The material in which the atoms are arranged regularly in some directions but not in others, is called
84152. The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.
84153. Crystal structure of a material is, generally, examined by
84154. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
84155. The coke in the charge of blast furnace
84156. Nimonic contains __________ percentage of nickel as that of Inconel.
84157. The heat treatment process used for softening hardened steel is
84158. The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.
84159. The electric process of steel making is especially adopted to
84160. Iron ore is, usually, found in the form of
84161. The hardness of steel increases if it contains
84162. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
84163. Ferrite and pearlite makes the steel soft and ductile.
84164. The lower critical temperature
84165. Nodular cast iron is produced by adding __________ to the molten cast iron.
84166. Free carbon in iron makes the metal
84167. The cupola is used to manufacture
84168. The type of space lattice found in gamma-iron is
84169. The property of a material due to which it breaks with little permanent distortion, is called
84170. Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?
84171. The hardness of steel depends upon the
84172. Cartidge brass can be
84173. There are 3 white balls and 2 black balls.If a ball is taken random,what is the probability that it is a black ball?
84174. Blast furnace is used to produce
84175. In flame hardening, oxy-acetylene flame is used.
84176. Which of the following statements are true for annealing of steels?
84177. The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility.
84178. Which of the following steel making process is being adopted at Rourkela Steel Plant?
84179. 18-4-1 high speed steel contains
84180. Which of the following statement is true about brittle fracture?
84181. Grey cast iron has
84182. Induction hardening is basically a
84183. When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces
84184. The strength is the ability of a material to resist
84185. The material widely used for making pendulums of clocks is
84186. The stiffness is the ability of a material to resist
84187. The blade of a power saw is made of
84188. In induction hardening __________ is high.
84189. The metal suitable for bearings subjected to light loads, is
84190. The property of a material essential for spring materials is
84191. A steel with carbon above 0.8% is known as hyper-eutectoid steel.
84192. Which of the following material has nearly zero coefficient of expansion?
84193. In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.
84194. The alloying element which can replace tungsten in high speed steels is
84195. An aluminium alloy with 11% silicon is used for making engine pistons by die casting technique.
84196. Which of the following is an amorphous material?
84197. The machinability of steel is improved by adding
84198. The carbon in the pig iron varies from
84199. The type of space lattice found in alpha-iron is
84200. The brown smoke during the operation of a bessemer Converter indicates that the
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