chemical engineering Mcqs
201. The highest stress that a material can withstand for a specified length of time without excessive deformation is called the ____________ strength ?
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A. Creep

B. Fatigue

C. None of these

D. Endurance

202. Bad odour in sanitary latrines is reduced by periodically sprinkling_____________________?
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A. Aluminium sulphate

B. Bleaching powder

C. None of these

D. Lime powder
203. Vibration upto 100 kilo hertz can be most accurately measured by a ________________ type accelerometer ?
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A. Preloaded spring

B. None of these

C. Piezoelectric

D. Bonded strain gauge

204. The main reducing agent in iron blast furnace is____________________?
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A. Air

B. Carbon monoxide

C. Oxygen

D. Carbon dioxide

205. The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process ?
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A. None of these

B. Sherardizing

C. Cyaniding

D. Spheroidising

206. Yield strength of a material is determined by the __________________ test?
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A. Creep

B. Tension

C. Endurance

D. Compression

207. Fibrous fracture is normally encountered in the ____________________ materials?
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A. Elastic

B. Hard

C. Brittle

D. Ductile
208. Minimum thermal efficiency of a steam boiler may be around ____________________ percent ?
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A. 45

B. 25

C. 65

D. 20
209. Satellites burn off during re-entry to earths atmosphere, because of the ____________________?
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A. Combustion with air

B. Friction with earths atmosphere

C. Gravitational pull by earth

D. Loss in weight of the satellite

210. Which of the following is the most wear resistant grade of carbide used for the cutting tools ?
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A. Tungsten carbide

B. Iron carbide

C. Aluminium carbide

D. Nickel carbide

211. Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is ___________________?
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A. White cast iron

B. Grey cast iron

C. Chilled cast iron

D. Malleable iron
212. Which of the following is not a characteristic observed in material failure by fatigue fracture ?
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A. Plastic deformation of material does not occur

B. Initiation of crack from below the surface does not occur

C. Initiation of crack occurs on the surface of the machine part

D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the

213. Which of the following is an example of stress corrosion ?
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A. Season cracking of brass

B. Caustic embrittlement of steel

C. Both A. & B.

D. Neither A. nor (B)

214. Nickel and ______________ are the alloying element added in steel to increase its toughness?
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A. Chromium

B. Vanadium

C. Silicon

D. Molybdenum

215. Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to ________________ boiling ?
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A. Transition

B. Film

C. All modes of

D. Nucleate

216. Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank) ?
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A. H/4

B. H/6

C. H/2

D. H

217. Silicon in steel__________________?
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A. Increases its electrical resistivity and decreases the hysteresis loss

B. All A, B & C

C. Is present upto 5% & 4% respectively when used in transformers & motor armatures

D. Makes it usable in almost all magnetic circuits where alternating current is used

218. Brinell Hardness Number (BHN) for talc is approximately in the range of ____________________?
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A. 20-30

B. 5-Jan

C. 200-250

D. 100-150

219. The temperature at which the magnetic property of iron disappears (i.e., it becomes nonmagnetic) and its electrical conductivity & specific heat also changes, is called the Curie point, which is ________________ C ?
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A. 1400

B. 1539

C. 908

D. 768
220. The majority charge carriers in p-type silicon are______________________?
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A. Holes

B. Conduction electrons

C. Ions

D. Free electrons

221. Material of construction of the electrode used in the electric resistance welding is___________________?
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A. Steel

B. Graphite

C. Copper

D. Stainless steel

222. Uniform ramming of sand in green sand moulding process leads to____________________?
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A. Uniform flow of molten metal into the mould cavity

B. Reduced chance of gas porosity

C. Greater dimensional stability of the casting

D. Less sand expansion type of casting defect

223. _______________ test can be termed as the semi-destructive test?
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A. Charpy

B. Torsion

C. Hardness

D. Impact

224. The bolt is subjected to _______________ when the nut is tightened by putting the washer beneath it?
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A. Bending & tension

B. Compression

C. Shear

D. Tension
225. Matte smelting is used in the extraction of_____________________?
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A. Copper

B. Lead

C. Aluminium

D. Zinc

226. Which of the following is an ore dressing operation ?
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A. Smelting

B. None of these

C. Classification

D. Roasting

227. The surface tension of a liquid, at critical temperature is____________________?
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A. Zero

B. Same as that at any other temperature

C. Infinity

D. Indeterminate

228. Carnot cycle is also termed as the constant _________________ cycle in thermodynamics?
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A. Entropy

B. Heat

C. Pressure

D. Volume

229. Stresses encountered in the metal forming processes are less than the _____________ of the material?
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A. Limit of proportionality

B. Elastic limit

C. Fracture strength

D. Yield strength

230. Which of the following has the least value of ultimate tensile strength (UTS) ?
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A. Wrought iron

B. Medium carbon steel

C. Cast iron

D. High carbon steel
231. In an eutectic system, two elements are completely____________________?
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A. Soluble in solid state

B. Insoluble in liquid state

C. Insoluble in both solid & liquid state

D. Soluble in liquid state
232. Youngs modulus of a material is the measure of its ___________________?
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A. Creep resistance

B. Malleability

C. Tensile strength

D. Stiffness
233. The specific gravity of coal depends mainly on its __________________ content ?
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A. Ash

B. Volatile matter

C. Carbon

D. Moisture
234. Babbitt lining is used on brass/bronze bearings to increase the____________________?
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A. Compressive strength

B. Antifriction properties

C. Wear resistance

D. Bearing resistance

235. An atom bomb works on the principle of __________________?
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A. Nuclear fission

B. Nuclear fusion

C. Both the nuclear fission & fusion

D. Ionisation

236. When the wavelength of incident X-rays increases, the angle of diffraction__________________?
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A. Decreases

B. Remain constant

C. Shows no systematic variation

D. Increases

237. Which of the following equipments is used for liquid dispersion ?
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A. Wetted wall column

B. Venturi scrubber

C. Bubble cap plate column

D. Packed column

238. Austempering process results in the formation of ________________ structure ?
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A. Carburised

B. Stressed

C. Bainitic

D. Martensitic

239. Factor of safety in machine design is defined as the ratio of ultimate stress to _____________ stress ?
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A. Bearing

B. Working

C. None of these

D. Yield

240. One face of a furnace wall is at 1030C and the other face is exposed to room temperature (30C). If the thermal conductivity of furnace wall is 3 W. m-1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is____________________?
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A. 10000

B. 100

C. 9000

D. 900

241. Machinability of hard alloys and tool steels is improved by_____________________?
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A. Spheroidising

B. Annealing

C. Tempering

D. Normalising

242. Cast iron contains ____________________ percent carbon?
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A. 3.75

B. 2.5

C. 5.25

D. 4.75

243. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be_____________________?
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A. 1.25

B. 5

C. 3.75

D. 2.5

244. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the________________?
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A. Resilience

B. Endurance limit

C. Creep strength

D. Fatigue strength

245. Work done by a/an _________________ process is determined by ?p. dv ?
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A. Isentropic

B. Isothermal

C. Adiabatic

D. Quasi-static
246. Friction factor for fluid flow in pipe does not depend upon the________________?
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A. Pipe length

B. Mass flow rate of fluid

C. Pipe roughness

D. Fluid density & viscosity

247. The most important requirement for aluminium industry is the availability of cheap _______________?
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A. Abundant water

B. Ore

C. Electrical power

D. Labour

248. Which of the following does not have a sharp melting point ?
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A. Thoria

B. Glass

C. Pig iron

D. Ice

249. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding _______________ grinding wheel is normally used ?
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A. Silicon carbide

B. Soft

C. Aluminium oxide

D. Hard

250. Maximum permissible air velocity in pipelines is about ______________ metre/second ?
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A. 20

B. 10

C. 40

D. 5