chemical engineering chemical engineering basics MCQs – Page 28

Practise multiple-choice questions from chemical engineering chemical engineering basics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
541. Increase in temperature, in general results in the____________________?
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A. Decrease in the viscosities of both liquids & gases

B. Increase in the viscosities of both liquids & gases

C. Increase in the viscosity of liquids and decrease in that of gases

D. Decrease in the viscosity of liquids and increase in that of gases
542. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ?
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A. A1 is more alkaline than solution A2

B. A1 is highly acidic

C. A2 is very slightly acidic

D. Both B. & C.
543. Large scale fire on fuel gas line is normally extinguished by________________?
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A. Nitrogen

B. Foam

C. Water

D. Steam

544. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 10-16 m2S-1 and it is 1.94 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
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A. 230

B. 180

C. 130

D. 250

545. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother ?
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A. Cresylic acid

B. All A, B. & C.

C. Xanthaies

D. Pine oil

546. Exposure to _________________ accelerates the degradation of plastics?
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A. Damp atmosphere

B. Ultraviolet radiation

C. High ambient temperature

D. High atmospheric temperature

547. Name the safety device used to protect the boiler, when the water level falls below a minimum level ?
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A. Blow off cock

B. Fusible plug

C. Safety valve

D. Blow down valve

548. Hydrogen can be ________________?
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A. Produced by electrolysis of water

B. Used in I.C. engines as fuel

C. Liquefied & stored under cryogenic conditions

D. All (A), B. & C.
549. Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
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A. Iron ore

B. Coke

C. Limestone

D. Sinter

550. Routing in production, planning & control is concerned with the___________________?
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A. Authorisation of work to be performed

B. Progress of work performed

C. Sequence of operation to be performed

D. Balancing of load on machines

551. 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. x-0.8

B. x0.8

C. x1.5

D. x-1.5

552. Which of the following can be manufactured using powder metallurgy techniques ?
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A. Bearings

B. All A, B and C

C. Carbide tool tips

D. Brake linings

553. ______________ cannot increase the fatigue strength of a material?
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A. Grain coarsening

B. Grain refining

C. Shot peening

D. Surface hardening

554. A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ?
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A. Independent of

B. None of these

C. Directly proportional to

D. Inversely proportional to

555. Euler number is defined as the ratio of inertia force to _______________ force?
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A. Gravity

B. Viscous

C. Pressure

D. Elastic

556. With decrease in the grain size of a material, its creep resistance___________________?
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A. Either A. or B.; depends on the material

B. Decreases

C. Increases

D. Remain constant
557. Hookes law_______________________?
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A. None of these

B. States that stress is inversely proportional to strain upto elastic limit

C. Applies to elastic deformation

D. Applies beyond limit of proportionality in stress-strain curve

558. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
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A. Propane and LPG

B. B.F gas and coke oven gas

C. Sewage gas and gobar gas

D. Propane and acetylene

559. Identify the correct statement with reference to the extractive metallurgy of aluminium ?
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A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3

B. Anode effect sets in when the cryolite concentration goes below 40%.

C. Sodium is deposited along with aluminium, but is immediately vaporised

D. Approximately 80% of the aluminium deposited on the cathode comes from cryolite

560. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will _______________?
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A. Increase rapidly

B. Increase gradually

C. Remain constant

D. Decrease gradually