chemical engineering chemical engineering basics MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
161. As the fluid flow rate increases, the float of the Rotameter____________________?
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A. Rises in the tube

B. Drops down in the tube

C. Rotates at higher speed

D. Rotates at lower speed

162. The majority charge carriers in p-type silicon are______________________?
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A. Conduction electrons

B. Free electrons

C. Holes

D. Ions

163. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ?
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A. 1000-1500

B. 120-500

C. 1500-3000

D. 10-May

164. Pick out the correct combination about the role of various additives used in polymers ?
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A. Plasticiser: increases the polymer strength

B. Heat stabiliser: increases the maximum service temperature

C. Lubricants: increases the flexibility of polymers

D. Fillers: Does not affect the property of polymer but increases its weight
165. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
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A. Wrought iron

B. Copper

C. Aluminium

D. Lead
166. Amortization in respect of financial obligation of a company means the_____________________?
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A. Commitment of financial obligation on priority

B. Modernisation of the plant equipments

C. Liquidation of financial obligations on instalment basis

D. Liquidation of all the obsolete equipments of the company

167. __________________ stress cannot be sustained by a fluid in equilibrium ?
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A. Shear

B. Tensile

C. Compressive

D. None of these

168. A dummy activity is used in PERT network to describe the_____________________?
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A. Resource idleness

B. Precedence relationship

C. Necessary time delay

D. Resource restriction

169. Inertial forces are obtained, when the elastic forces are multiplied by ______________ number?
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A. Euler

B. Froude

C. Reynolds

D. Mach
170. Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of ________________?
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A. Aluminium

B. Paper

C. Lead

D. Cloth

171. Evaporative cooling process employs a combination of cooling and humidification in which the____________________?
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A. Sensible heat is added

B. Sensible heat is removed and the latent heat is added

C. Sensible heat is added and latent heat is removed

D. Latent heat is removed

172. The same volume of all gases is representative of their_____________________?
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A. Molecular weights

B. Specific gravities

C. Gas characteristic constants

D. Densities

173. Which of the following is the most suitable abrasive for grinding high tensile strength materials ?
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A. Boron carbide

B. Silicon carbide

C. Aluminium oxide

D. Corundum

174. Unit of viscosity in CGS system is_______________________?
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A. gm . cm . sec-1

B. gm .cm-1 sec-1

C. gm . cm2 . sec-2

D. gm .cm-2, sec-1

175. Force between the molecules of the same substance is called ______________________ force?
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A. Cohesive

B. Adhesive

C. Vander Walls

D. Molecular

176. Sub zero treatment of steel is done to____________________?
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A. Suppress martensite transformation

B. Enhance its working performance in sub zero atmosphere

C. Reduce the retained austenite in hardened steel

D. Induce temper brittleness after its hardening

177. Corrosion is____________________?
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A. A chemical phenomenon

B. A physical phenomenon

C. Same as erosion

D. An uncontrollable phenomenon

178. The best lubricants for a machine working at high temperature & load is_________________?
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A. Grease

B. Mineral oils

C. Solid lubricant

D. Animal oils

179. The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ?
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A. Two

B. Six

C. Four

D. Eight

180. Cryogenics is concerned with the generation & use of low temperature in the range of____________________?
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A. 0C to 273C

B. 0K to 273K

C. 0K to 123K

D. 0C to 123C