chemical engineering MCQs – Page 26

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 Review each marked answer and report any item that may be outdated or unclear.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

501. Pick out the wrong statement ?
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A. High residual stress at the surface is beneficial for fatigue properties of a material

B. Phosphorous can be easily recovered in the iron blast furnace

C. Cold cracking of a weld is due to the presence of hydrogen gas in the weld

D. True stress is given by, ? = ?E (1 + ?E), where ?E and ?E are engineering stress and

E. ineering strain respectively

502. Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
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A. Limestone

B. Coke

C. Iron ore

D. Sinter

503. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?
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A. 100% direct reduction

B. 30-40% indirect reduction

C. 50-60% indirect reduction

D. 100% indirect reduction

504. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?
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A. 90 & 10

B. 70 & 30

C. 50 & 50

D. 30 & 70

505. During sensible heating of humid air__________________?
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A. Relative humidity increases

B. Dew point remains constant

C. Dry bulb & wet bulb temperature increases

D. Both B & C

506. Coating provided on the electrodes used in the arc welding is not expected to_________________?
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A. Add alloying elements

B. Provide protective atmosphere to weld

C. Prevent electrode from contamination

D. Stabilise the arc

507. Satellite is a _________________ material?
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A. Ferrous

B. Non-ferrous cast alloy cutting tool

C. Cemented carbide

D. Ceramic

508. Electrostatic separation of minerals from each other is based on their differences in the following property ?
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A. Hardness

B. Electrical conductivities

C. Densities

D. Magnetic permeabilities

509. Which of the following properties of a solid is not dependent on crystal imperfection ?
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A. Melting point

B. Yield stress

C. Semi-conductivity

D. Ductility

510. A metal having a Poissons ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is________________?
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A. 0.08

B. -0.24

C. -0.8

D. 0.8

511. Pick out the wrong statement ?
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A. erials

B. rcive forces

C. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic

D. A ferromagnetic material becomes paramagnetic above the Curie temperature

E. Tungsten steel and alnico are not hard magnetic materials

F. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and

512. Which of the following are considered applications of ultrasonic testing ?
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A. Measurement of material thickness

B. None of the above

C. Detection of defects in metal

D. Determination of elastic constant

513. Out of the following, the most malleable material is________________?
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A. Wrought iron

B. Copper

C. Lead

D. Aluminium

514. The transition temperature for ductile to brittle behavior of steel increases with increase in the _____________ content in steel?
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A. Carbon

B. Manganese

C. Both A nor B

D. Neither A nor B

515. Lead pencil contains____________________?
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A. Graphite

B. Lead sulphide

C. Lead

D. Both B. & C.

516. Internal energy of a gas obeying Van-Der-Waals equation of state, [p + (a/v2)] (V b) = RT, depends upon its___________________?
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A. Pressure & specific volume

B. Temperature & specific volume

C. Temperature only

D. Pressure & temperature

517. Pick out the correct statement ?
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A. ocrystalline materials due to the presence of grains of different orientations

B. The damping capacity of a material is due to its plastic deformation

C. The elastic behaviour of rubber under compression is the same as its behaviour under tension

D. Materials exhibiting high elasticity obey Hookes law

E. The stress required to cause plastic flow in polycrystalline material is higher as compared to

518. Iron content in Indian iron ore is about _________________ percent?
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A. 40-45

B. 80-85

C. 20-25

D. 60-65

519. Insulation of liquid surface can be achieved by _____________ on top of its surface?
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A. Putting cement

B. None of these

C. Spraying alumina powder

D. Floating hollow polypropylene spheres

520. If a solid is compressed adiabatically in its elastic range, its _____________ remains constant ?
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A. Temperature

B. Enthalpy

C. Internal energy

D. Entropy

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