chemical engineering MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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

181. At the point of boundary layer separation in fluid flow, the _____________________?
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A. Shear stress is zero

B. Density variation is maximum

C. Velocity gradient is flat

D. Shear stress is maximum

182. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same___________________?
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A. Period increases

B. Period decreases

C. Group increases

D. Both B & C

183. Dowtherm is a____________________?
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A. Product of coal tar distillation

B. None of these

C. Very heat sensitive material

D. High temperature heating medium (a petroleum product)

184. Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________?
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A. Made by sand casting

B. Seamless & made of steel

C. Welded steel cylinders

D. Heat treated before use

185. _______________ test determines the yield strength, Youngs modulus of elasticity, percentage reduction in area & percentage elongation of a material ?
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A. Tensile

B. None of these

C. Fatigue

D. Impact

186. With increase in temperature, the surface tension of water_______________________?
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A. Decreases

B. Remain constant

C. Increases linearly

D. Increases

187. Biological shield in a nuclear reactor is generally provided to protect against the__________________?
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A. ?-rays

B. Electrons

C. ?-rays

D. Gamma rays & neutrons

188. Which of the following is not a dielectric material ?
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A. Cotton, silk and paper

B. All refractory materials

C. Rubber and polymeric resins

D. Asbestos, glass, porcelain and mica

189. Which of the following is not categorised as the ore agglomeration process ?
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A. Briquetting

B. Nodulising

C. Pelletising

D. Balling

190. Tesla metre per ampere (T. m/A) is the unit for the measurement of_______________?
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A. Permeability of free space

B. Flux density

C. Magnetic moment

D. Magnetic susceptibility

191. Silicon percentage in the silicon steel used for electrical appliances/equipments is_________________?
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A. 20-25

B. 0.3-0.4

C. 3-4

D. 14-Dec

192. Neutrons are present in all atoms except that of ___________________?
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A. Ar

B. He

C. H

D. C

193. There are one octahedral void and ______________ tetrahedral void in the closest packing of atoms ?
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A. Three

B. One

C. Two

D. None of these

194. With increase in compression ratio, the volumetric efficiency of air compressor____________________?
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A. May increase or decrease (depends on the suction pressure)

B. Remain same

C. Decreases

D. Increases

195. Eutectic reaction for iron-carbon system occurs at a temperature of _______________ C ?
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A. 723

B. 1147

C. 959

D. 1493

196. Normalising does not ______________________ of a metal ?
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A. Remove internal stresses

B. Refine the structure

C. Remove strains caused by cold working

D. Improve machinability & tensile strength

197. Basic open hearth furnace (BOF) is not used for producing ______________ steel?
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A. Killed

B. None of these

C. Rimming

D. High alloy

198. Normalising does not _____________________ of a metal?
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A. Remove internal stresses

B. Refine the structure

C. Improve machinability & tensile strength

D. Remove strains caused by cold working

199. A solution which resists change in its pH value on addition of acid/alkali is called the ____________________ solution?
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A. Buffer

B. Neutral

C. Ideal

D. Zero pH

200. A reduction in thermal resistance during heat transfer does not occur in the___________________?
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A. Convection heat transfer by stirring the fluid and cleaning the heating surface

B. Conduction heat transfer by reduction in the material thickness and increase in the thermal

C. None of these

D. ductivity

E. Radiation heat transfer by increasing the temperature and reducing the emissivity

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