chemical engineering MCQs – Page 254

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 Review each marked answer and report any item that may be outdated or unclear.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
5061. Pick out the wrong statement ?
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A. One important copolymer of styrene is SBR, which is widely used in the manufacture of

B. For the manufacture of styrene, the major raw materials are benzene and ethylene

C. omobile tyres

D. Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available

E. Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis

5064. Pick out the one which is a first order instrument ?
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A. Mercury in glass thermometer (without any covering or air gap)

B. Bare metallic thermometer

C. Bare vapor pressure thermometer

D. All A., B. and C.
5065. Critical mass is the minimum mass of nuclear fissile material required for the_______________________?
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A. Economic power generation

B. Sustainment of chain reaction

C. Power generation on commercial scale

D. None of these

5067. _____________ scrap can be recycled & reutilised?
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A. Bakelite

B. None of these

C. Epoxy resin

D. Polythene
5068. Pick out the wrong statement?
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A. 1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25

B. A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V

C. A gas bubble at a pressure of Pg is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to Ps/Pg

D. To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg

5070. Pick out the wrong statement ?
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A. Hammer crushers operate by impact action

B. With increase in mesh number of screens, their diameter in microns decreases

C. 200 mesh screen has 200 openings per linear cm

D. Standard screens have circular opening

5071. Pick out the correct statement ?
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A. Addition of catalyst changes the equilibrium constant

B. A catalyst speeds up the forward reaction but slows shown the reverse reaction

C. The composition of equilibrium is changed by catalyst

D. Pressure changes do not change the equilibrium concentrations
5072. Dacron is a/an ___________________?
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A. Inorganic polymer

B. Unsaturated polyester

C. Polyester

D. Polyamide

5073. The half life period of a radioactive element depends upon the___________________?
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A. Amount of element present

B. Temperature

C. None of these

D. Pressure

5074. Pick out the wrong statement ?
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A. Arrhenius equation describing the effect of temperature on rate constant is given by,

B. A.e-Ea/RT

C. n the rate of disappearance of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst</strong>

D. Two mixed reactors of unequal size are available for producing a specified product, formed by

E. omogenous second order reaction. To achieve maximum production rate, the smaller

F. I + HI ? CH4 + I2; fast

5075. Which one is different for the neutral atoms of the isotopes of an element ?
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A. Number of protons

B. Atomic numbers

C. Number of electrons

D. Atomic weights
5076. Non sulphonated hard bakelites are not used for making _______________________?
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A. Ion-exchange resins

B. Formica table tops

C. Fountain pen barrels

D. Combs

5078. Thermal shield is used in high powered nuclear reactors to__________________?
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A. Absorb the fast neutrons

B. Slow down the secondary neutrons

C. Protect the walls of the reactor from radiation damage

D. Protect the fuel element from coming in contact with the coolant

5079. Transistor parts and refrigerator components are normally made of_____________________?
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A. Polyurethane

B. Polystyrene

C. Polyester

D. High density polythene

5080. Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?
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A. All A., B. and C.

B. Poor tensile strength

C. Greater amount of heat build up heavy loading

D. Poorer resistance