chemical engineering MCQs – Page 28

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 Review each marked answer and report any item that may be outdated or unclear.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

541. Multistage compression of air as compared to single stage compression offers the advantage of______________?
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A. Moisture elimination in the inter-stage cooler

B. All A , B. & C.

C. Power saving per unit weight of air delivered

D. Increased volumetric efficiency

542. Globular form of cementite is formed during the _________________ process ?
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A. Spheroidising

B. Normalising

C. Hardening

D. Annealing

543. Pick out the correct statement?
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A. Hot worked materials are subjected to annealing to remove internal stresses

B. Annealing of steel hardens it slightly

C. Normalising of a material induces stresses

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness

544. If Reynolds number is greater than 1, then the_____________________?
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A. Inertia force is larger than the viscous force

B. Inertia force is larger than the surface tension force

C. Inertia force is larger than the gravitational force

D. Viscous force is larger than the inertia force

545. Otto cycle used in spark ignition petrol engines is also known as the constant ________________ cycle?
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A. Heat

B. Pressure

C. Volume

D. None of these

546. Probability of cavitation occuring becomes very high, when the local _______________ resulting ?
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A. Pressure falls below the vapour pressure

B. water bubbles formation, which on rupture cause cavitation

C. All A, B & C

D. Pressure becomes very high

E. Temperature becomes low

547. High endurance limit of carburised machine parts is because of the fact that carburisation __________________?
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A. Introduces a compressive layer on the surface

B. Produces a better surface finish

C. Enhances the yield point of the material

D. Suppresses any stress concentration produced in the parts

548. Pick out the wrong statement ?
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A. Both annealing and normalising release the internal stresses of the material besides improving

B. mechanical properties

C. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it

D. subjected to case hardening or surface hardening processes like cyaniding, carburising,

E. riding etc., which produces high carbon outer layers resulting in increase of surface

F. dness

549. Identify the correct statement?
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A. Sphlerite is zinc oxide

B. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite

C. The first law of the thermodynamics is stated as ?E = ?Q ?W

D. Lead can be produced in a blast furnace

550. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?
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A. Lower, as it gives shorter wavelength

B. Higher, as it gives shorter wavelength

C. Lower, as it gives higher wavelength

D. Higher, as it gives higher wavelength

551. Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?
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A. 0.8

B. 2

C. 6

D. 3

552. Out of the following, the lowest packing of atoms exists in ____________________ crystal lattice structure?
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A. Face centred cubic (fcc)

B. Hexagonal close, packed (hcp)

C. Body centred cubic (bcc)

D. Simple cubic

553. A material being tested for endurance strength is subjected to the _____________ load?
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A. Impact

B. Dynamic

C. Completely reversed

D. Static & dynamic

554. Preheating before welding is done to____________________?
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A. Prevent cold cracks

B. Make the plate softer

C. Burn oil & grease sticking to plate surfaces

D. Avoid plate distortion

555. Photographic plates are coated with _____________________?
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A. Calcium silicate

B. Silver nitrate

C. Silver halide

D. Metallic silver

556. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?
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A. x0.8

B. x1.5

C. x-0.8

D. x-1.5

557. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the_______________?
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A. Stress recovery effect

B. Work hardening

C. Bauschinger effect

D. Creeping effect

558. The activity co-efficient of the solute in a dilute solution ?
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A. Remains constant

B. Increases with the increase of concentration of the solute

C. Decreases with the increase of concentration of the solute

D. Is unity at infinite dilution

559. The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ?
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A. 225.65

B. 100.03

C. 273.15

D. 373.15

560. Out of the following _______________ iron has the best capability to bear sudden & excessive shocks?
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A. Wrought

B. Cast

C. White

D. Pig

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