chemical engineering MCQs – Page 257

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 Review each marked answer and report any item that may be outdated or unclear.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

5121. Main source of ______________ is monazite sand?
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A. Polonium

B. Uranium

C. Hafnium

D. Thorium

5122. Pick out the wrong statement?
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A. A catalyst increases the potential energy barrier over which the reactants must pass to form products

B. Exit age description function E. and internal age distribution function (I) are related as, E = -(dI/d?)

C. A higher temperature favours the reaction of higher activation energy

D. Chemisorption studies are useful in the determination of catalyst surface area and pore size distribution

5123. Automobile steering wheels are normally made of__________________?
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A. Cellulose acetate

B. PVC

C. High density polythene

D. Cellulose nitrate

5124. Critical mass is the minimum mass of nuclear fissile material required for the__________________?
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A. Sustainment of chain reaction

B. Economic power generation

C. Power generation on commercial scale

D. None of these

5125. Which of the following is not, a fertile material ?
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A. U-238

B. Th-232

C. None of these

D. U-233

5126. Which is not a fissile nuclear material ?
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A. U-233

B. U-238

C. U-235

D. Pu-239

5127. The new nucleus formed after ?-decay of a radioactive element has___________________?
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A. Less atomic number

B. More atomic weight

C. Less atomic weight

D. More atomic number

5128. Both tritium and deuterium have the same number of_______________?
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A. Protons

B. Electrons

C. Nucleons

D. Neutrons

5129. Orlan fibre which is used as a wool substitute is __________________?
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A. Poly-methyl-methacrylate (PMMA)

B. Polyacrylonitrile

C. A natural polymeric fibre

D. An amorphous polymer

5130. Pick out the correct statement ?
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A. A chemical reaction accompanied by evolution of heat is called an endothermic reaction

B. Chemical equilibrium state is dynamic in nature

C. The rate constant for a first order reaction does not change on changing the concentration units

D. A chemical reaction accompanied by absorption of heat is called an exothermic reaction

5131. Pick out the wrong statement ?
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A. In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time

B. In a semi-batch reactor, one reactant is charged batch wise, while the other reactant is fed continuously

C. In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system

D. In a continuous flow reactor, both the reactants and the products flow out continuously

5132. An electron has a mass that is approximately ____________ that of the proton?
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A. 1836 (approximately)

B. ?

C. 1/1836 (approximately)

D. 1

5133. Polyvinyl chloride (PVC) is __________________?
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A. Made by employing emulsion polymerisation

B. A condensation polymerisation product

C. A thermosetting material

D. None of these

5134. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are__________________?
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A. 20C and 1 kgf/cm2

B. 5C and 1 kgf/cm2

C. 0C and 1 kgf/cm2

D. 0C and 3 kgf/cm2

5135. _______________ practically possess no elasticity?
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A. Vulcanite or ebonite

B. Epoxy resin

C. Spandex fibre

D. Polysulphide rubber

5136. In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous ________________?
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A. Uranium sulphate

B. Uranium hexafluoride

C. Uranium oxide

D. Uranium carbide

5137. Addition of stabiliser during PVC manufacture is done to________________?
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A. Improve its elasticity

B. Reduce the melt viscosity & glass transition temperature

C. Prevent its thermal degradation

D. Improve its impact strength

5138. Absorption/scattering cross-section of an element is expressed in barn, which is equivalent to___________________?
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A. 10-24 cm

B. 10-12 cm

C. 10-24 cm2

D. 1 Angstrom

5139. Pick out the correct statement?
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A. A photochemical reaction is catalysed by light

B. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

C. Chemical equilibrium is a static state

D. Reactions with high activation energies are very temperature sensitive

5140. Pick out the correct statement ?
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A. The operating cost of shaking screen is more than that of a vibrating screen

B. Removal of iron from ceramic material is necessitated (by magnetic separation method) so as

C. Screen capacity does not depend upon the specific gravity of the minerals

D. Asphalt is best crushed using toothed roll crusher

E. avoid discolouration of ceramic products</strong>

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