chemical engineering MCQs – Page 11

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

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