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You Are On Multi Choice Question Bank SET 1685
84251. Age hardening is related to
(A): duralumin (B): brass (C): copper (D): silver
84252. The addition of which of the following improves machining of copper?
(A): Sulphur (B): Vanadium (C): Tin (D): Zinc
84253. When a medium carbon steel is heated to coarsening temperature,
(A): there is no change in grain size (B): the average grain size is a minimum (C): the grain size increases very rapidly (D): the grain size first increases and then decreases very rapidly
84254. Phosphorus is added in low carbon steels to raise its yield point.
(A): True (B): False
84255. In process annealing, the hypo-eutectoid steel is
(A): heated from 30° C to 50° C above the upper critical temperature and then cooled in still air (B): heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium (C): heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace (D): heated below or close to the lower critical temperature and then cooled slowly
84256. Delta-iron occurs between the temperature range of
(A): 400°C to 600°C (B): 600°C to 900°C (C): 900°C to 1400°C (D): 1400°C to 1530°C
84257. According to Indian standard specifications, SG 400/15 means
(A): spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa (B): spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation (C): spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area (D): none of the above
84258. White cast iron has
(A): carbon in the form of carbide (B): low tensile strength (C): high compressive strength (D): all of these
84259. Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons.
(A): equal to (B): less than (C): more than
84260. The stiffness is the ability of a material to resist deformation under stress.
(A): True (B): False
84261. The acidic bessemer process is suitable for producing steel from pig iron containing large quantities of phosphorus.
(A): Correct (B): Incorrect
84262. In low carbon steels, presence of small quantities of sulphur improves
(A): weldability (B): formability (C): machinability (D): hardenability
84263. Cast iron is used in those parts which are subjected to shocks.
(A): Correct (B): Incorrect
84264. The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
(A): duralumin (B): Y-alloy (C): magnalium (D): hindalium
84265. Y-alloy contains
(A): 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium (B): 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium (C): 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium (D): 5 to 6% tin, 2 to 3% copper and rest aluminium
84266. The steel scrap added in the charge of cupola controls the grade of cast iron produced.
(A): Correct (B): Incorrect
84267. The main alloying elements high speed steel in order of increasing proportion are
(A): vanadium, chromium, tungsten (B): tungsten, titanium, vanadium (C): chromium, titanium, vanadium (D): tungsten, chromium, titanium
84268. Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
(A): Babbit metal (B): Monel metal (C): Nichrome (D): Phosphor bronze
84269. Which of the following metal is used for nuclear energy?
(A): Uranium (B): Thorium (C): Niobium (D): all of these
84270. The bond formed by transferring electrons from one atom to another is called
(A): ionic bond (B): covalent bond (C): metallic bond (D): none of these
84271. Which of the following property is desirable in parts subjected to shock and impact loads?
(A): Strength (B): Stiffness (C): Brittleness (D): Toughness
84272. German silver contains
(A): 1% silver (B): 2% silver (C): 5% silver (D): no silver
84273. Connecting rod is, usually, made from
(A): low carbon steel (B): high carbon steel (C): medium carbon steel (D): high speed steel
84274. Which of the following inpurity in cast iron makes it hard and brittle?
(A): Silicon (B): Sulphur (C): Manganese (D): Phosphorus
84275. There are fourteen atoms in a unit cell of
(A): body centred cubic space lattice (B): face centred cubic space lattice (C): close packed hexagonal space lattice (D): none of these
84276. The maximum internal diameter of a blast furnace is about
(A): 3 m (B): 6 m (C): 9 m (D): 12 m
84277. In spheroidising process, the steel is
(A): heated below the lower critical temperature and then cooled slowly (B): heated upto the lower critical temperature and then cooled in still air (C): heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C (D): none of the above
84278. Pearlite is a combination of 87% ferrite and 13% cementite.
(A): Yes (B): No
84279. The percentage carbon content in wrought iron is about
(A): 0.02 (B): 0.1 (C): 02 (D): 0.4
84280. The alloying element which reduces the formation of iron sulphide in steel is
(A): chromium (B): nickel (C): vanadium (D): manganese
84281. For a steel containing 0.8% carbon
(A): there is no critical point (B): there is only one critical point (C): there are two critical points (D): there can be any number of critical points
84282. In high speed steels, manganese is used to tougher the metal and to increase its
(A): yield point (B): critical temperature (C): melting point (D): hardness
84283. The machinability of aluminium increases when __________ is added to aluminium.
(A): copper (B): magnesium (C): silicon (D): lead and bismuth
84284. Body centred cubic space lattice is found in
(A): zinc, magnesinm, cobalt, cadmium, antimony and bismuth (B): gamma-iron, aluminium, copper, lead, silver and nickel (C): alpha-iron, tungsten, chromium and molybdenum (D): none of the above
84285. When a low carbon steel is heated upto lower critical temperature,
(A): there is no change in grain size (B): the average grain size is a minimum (C): the grain size increases very rapidly (D): the grain size first increases and then decreases very rapidly
84286. Grey cast iron is __________ than white cast iron.
(A): softer (B): harder
84287. Corrosion resistance of steel is increased by adding nickel and chromium.
(A): Agree (B): Disagree
84288. The silicon steel is widely used for
(A): connecting rods (B): cutting tools (C): generators and transformers in the form of laminated cores (D): motor car crankshafts
84289. Ball bearings are, usually, made from
(A): low carbon steel (B): high carbon steel (C): medium carbon steel (D): chrome steel
84290. Macro-structure of a material is, generally, examined by
(A): naked eye (B): optical microscope (C): metallurgical microscope (D): X-ray techniques
84291. Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.
(A): Correct (B): Incorrect
84292. Which of the following property is desirable for materials used in tools and machines?
(A): Elasticity (B): Plasticity (C): Ductility (D): Malleability
84293. Babbit metal is a
(A): lead-base alloy (B): copper-base alloy (C): tin-base alloy (D): cadmium-base alloy
84294. The metal suitable for bearings subjected to heavy loads, is
(A): silicon bronze (B): white metal (C): monel metal (D): phosphor bronze
84295. The compressive strength of cast iron is __________ that of its tensile strength.
(A): equal to (B): less than (C): more than
84296. When a steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of
(A): mainly ferrite (B): mainly pearlite (C): ferrite and pearlite (D): pearlite and cementite
84297. Eutectoid reaction occurs at
(A): 600°C (B): 723°C (C): 1147°C (D): 1493°C
84298. The addition of copper to aluminium possesses maximum strength after heat treatment and age-hardening
(A): Correct (B): Incorrect
84299. Nickel when added to copper improves
(A): machinability (B): hardness (C): hardness and strength (D): strength and ductility
84300. In the lower part of the blast furnace (zone of fusion), the temperature is
(A): 400° to 700°C (B): 800°C to 1000°C (C): 1200°C to 1300°C (D): 1500°C to 1700°C
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