chemical engineering MCQs – Page 23

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 Review each marked answer and report any item that may be outdated or unclear.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

441. The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400C is__________________?
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A. Silica

B. Fireclay

C. Magnesite

D. Chrome

442. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about _______________ percent ?
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A. 50

B. 30

C. 10

D. 1

443. While the bin cards are used in the effective stores management, the queuing theory is associated with the _______________ time ?
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A. Tool replacement

B. Inspection

C. Idle

D. Waiting

444. With increase in impurities in metals, their corrosion resistances____________________?
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A. Remain same

B. Increase

C. Decrease

D. May increase or decrease; depending on the type of metal

445. In case of simple harmonic motion, displacement is proportional to the_________________?
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A. Velocity

B. Acceleration

C. Both A. & B.

D. Neither A. nor B.

446. ____________________ are normally subjected to sub-zero treatment?
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A. Non machinable materials

B. Gauges or precision parts

C. Highly stressed parts

D. Cold rolled sheets

447. Resilience of a bolt can be increased by increasing its __________________?
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A. Length

B. Head diameter

C. Shank diameter

D. None of these

448. Alloy powder manufactured by the following process have spherical shapes ?
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A. Gaseous reduction

B. Atomisation

C. Mechanical attrition

D. Electrochemical deposition

449. In case of water (Prandtl number ? 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ?
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A. Equal

B. More

C. Unpredictable

D. Less

450. Which of the following is not a charge material for cupola ?
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A. Iron ore

B. Limestone

C. Pig iron

D. Iron scrap

451. Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?
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A. Monel metal

B. Babbitt metal

C. Duralumin

D. Woods metal

452. If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity_________________?
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A. Remains unchanged

B. Is trebled

C. Decreases by a factor of 3

D. Decreases by a factor of 1/3

453. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be_______________?
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A. Straight line

B. None of these

C. Parabolic

D. Hyperbolic

454. In the Bayers process, bauxite is digested under pressure using ___________________?
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A. NH3

B. NaOH

C. H2SO4

D. HCl

455. Closeness of packing is maximum in case of ____________________ crystal lattice?
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A. None of these

B. Simple cubic

C. Face centred

D. Body centred

456. Mild steel has _______________ crystal lattice structure?
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A. Orthorhombic

B. Cubic

C. Face centred cubic (fcc)

D. Body centred cubic (bcc)

457. ____________ test is the appropriate test to determine whether a material is ductile or brittle ?
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A. Impact

B. Tensile

C. Cupping

D. Hardness

458. Milk is fat dispersed in water. It is an example of__________________?
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A. Solution

B. Emulsion

C. Gel

D. Suspension

459. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when_________________?
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A. Not affected by any of the above parameters

B. Grain size is increased

C. Prior cold deformation is increased

D. Strain rate is increased

460. _____________________ of grey cast iron produces white cast iron?
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A. Slow cooling

B. Rapid cooling

C. Tempering

D. Rapid heating

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