chemical engineering Mcqs
5151. Viscose rayon is _______________?
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A. Regenerated cellulose acetate

B. None of these

C. Regenerated cellulose nitrate

D. Cellulose nitrate

5154. Pick out the additive property of lube oil out of following ?
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A. Viscosity

B. API gravity

C. Specific gravity

D. Flashpoint

5155. Pick out the wrong statement ?
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A. A batch reactor cannot be used to study the kinetics of catalytic reaction

B. the products during the final stages of reaction

C. Hold back is defined as the fraction of material that stays longer than the mean residence time

D. For studying a chemical reaction, it is desirable to monitor the reactants during initial stages

E. Study of non-ideal flow reactor is done experimentally by stimulus-response technique

5156. Nylon-6 as compared to nylon-66 is_________________?
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A. Harder

B. Having higher melting point

C. More abrasion resistant

D. None of these
5157. Which of the following is not an ore of uranium ?
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A. Rescolite

B. Kyanite

C. Pitchblende

D. Carnotite

5158. Nylon-6 as compared to nylon 66 has lower ?
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A. Adhesion to rubber

B. Hardness

C. Thermal stability

D. Abrasion resistance
5159. Pick out the correct statement?
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A. Paraffins have higher octane number than corresponding iso-paraffin

B. Paraffins have lower smoke point than aromatics

C. Aviation fuel should have very high cloud point

D. Suitability of kerosene as a fuel & as an illuminant may be determined by char value test

5160. Pick out the correct statement?
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A. Pore volume and porosity of a catalyst is measured by Brunauer-Emmett-Teller (BET)

B. A lower temperature favours the reaction of lower activation energy

C. The dispersion number for a reactor/vessel is uL/D

D. hnique

E. The rate controlling step in a reaction involving many steps is the fastest step

5161. Which of the following is a copolymer ?
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A. PVC

B. Bakelite

C. Polythene

D. Teflon

5162. The monomer for the production of neoprene rubber is_________________?
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A. Acetylene

B. None of these

C. Chloroprene

D. Isoprene

5164. Mastication of rubber means_______________?
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A. Depression of its freezing point

B. Its softening

C. Improving its curing rate

D. A treatment to retard its deterioration due to oxidation

5166. Pick out the wrong statement ?
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A. Characterisation factor of paraffinic crude oil is more than 12

B. Abel apparatus is used for determining flash points below 50C

C. An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index

D. Pensky-Marten apparatus is used for determining flash points above 50C

5167. Pick out the wrong statement ?
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A. Molecularity of the reaction is always a whole number greater than zero

B. Visible radiation provides the necessary activation energy in photochemical reactions

C. For a second order reaction, the slope of the graph/plot between rate and (concentration) is

D. The order and molecularity of a complex reaction may not be the same

E. al to the rate constant (k)

5168. Research reactors are normally meant for_____________________?
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A. Producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron

B. Power generation

C. bardment on different materials</strong>

D. None of these

E. Accelerating the neutrons

5170. Perspex can be used as a substitute of glass. Its monomer is__________________?
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A. Tetrafluoroethylene

B. DMT

C. Methyl methacrylate

D. Butadiene

5171. Celluloid is__________________?
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A. Regenerated cellulose

B. Cellulose acetate

C. Cellulose nitrate

D. Cellulose acetate butyrate

5172. Buna-S is a _______________ material?
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A. Plastic

B. Resinous

C. Fibrous

D. Rubbery
5174. Silicone resins, which are highly water repellent and has good heat resistance cannot be used___________________?
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A. Hydraulic fluid for heat transfer

B. As room temperature adhesive

C. Resin for lamination

D. As grease & lubricant

5175. Alkyd resin e.g., glyptal resin formed by Phthalic anhydride and glycerine is not used_______________?
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A. For surface coating of automobiles & air crafts

B. As plasticiser for PVC & nitrocellulose

C. For film forming materials

D. For fibre making
5176. Pick out the wrong statement ?
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A. Autocatalytic reactions are exemplified by microbial fermentation reactions

B. The slowest step has the greatest influence on the overall reaction rate in case of an

C. eversible series reaction

D. The fractional conversion at any time is same for both the constant as well as the variable

E. ume system in case of an irreversible unimolecular type first order reaction

F. Hydrolysis of ester in presence of alkali or acid is a zero order reaction
5177. Pick out the wrong statement?
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A. There is no transfer lag for a single first order system

B. Transfer lag is a characteristic of all higher order systems (other than first order systems)

C. Stirred tank with a water jacket exemplifies an interacting system

D. Transfer lag decreases as the number of stages decreases
5178. Amino resins are used in paper treatment to improve its__________________?
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A. All A., B. & C.

B. Wet rub resistance

C. Folding endurance

D. Wet tear and bursting strength

5179. Pick out the wrong statement?
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A. Out of ?, ?, and ?-rays, the one having maximum penetration power are ?-rays

B. Atoms with same number of protons but different number of nucleons are called isoters

C. The product formed by emission of ?-particle has mass number less by 4 units than the parent nuclide

D. Atoms with same number of nucleons but different number of protons are called isobars

5180. Pick out the wrong statement pertaining to the turbine agitator ?
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A. Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow

B. blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator

C. Turbine agitator should be located at a height not less than one agitator diameter length from

D. meter)

E. bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two

F. tators should be used

5186. Thermoplastic resins usually____________________?
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A. Remain hard as long as they are hot

B. Less brittle than thermosetting resins

C. Cannot be reclaimed from waste

D. Permanent setting resins

5187. The organic acid monomer in nylon-66 is __________________?
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A. Terephthalic acid

B. Sebacic acid

C. Benzoic acid

D. Adipic acid
5188. Epoxy resins (i.e., epoxide polymers) ?
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A. Are made by addition polymerisation reaction only

B. Are cross-linked polymers only

C. Contain an epoxy group (fig bellow) at the ends of the polymer

D. Use emulsion polymerisation methods

5190. Which is a fertile nuclear fuel ?
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A. U-233

B. U-235

C. Th-232

D. Pu-239

5193. Pick out the first order system from among the following ?
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A. Mercury in glass thermometer kept in boiling water

B. Interacting system of two tanks in series

C. Damped vibrator

D. Non-interacting system of two tanks in series

5194. Pick out the correct statement?
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A. Loss of electrons from neutral atoms produces negative ions

B. Gain of electrons by neutral atoms form cations

C. Proton to neutron ratio in a stable nucleus is 2 : 1

D. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively
5195. Pick out the wrong statement?
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A. The nucleus of a hydrogen atom is identical with a proton

B. Mass of an electron is about 1/1800th of the lightest nucleus

C. A, ?-ray particle is identical with an electron

D. Positron is heavier than a proton
5196. Choose the correct statement?
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A. Coking tendency decreases with increasing molecular weight

B. Higher pressure enhances coke formation

C. Coking tendency increases with increasing molecular weight

D. Coking is an exothermic reaction