chemical engineering MCQs – Page 304

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 Review each marked answer and report any item that may be outdated or unclear.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

6061. In laminar flow through a round tube, the discharge varies ______________________?
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A. Inversely as the pressure drop

B. As the square of the radius

C. Linearly as the viscosity

D. Inversely as the viscosity

6062. Fireclay bricks are not used in the_____________________?
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A. Hot blast stove

B. Blast furnace

C. Wall of coke oven

D. Cupola

6063. Newtons law of viscosity relates the____________________?
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A. Shear stress and velocity

B. Pressure gradient and rate of angular deformation

C. Velocity gradient and pressure intensity

D. Shear stress and rate of angular deformation in a fluid

6064. Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newtons law of viscosity. (II) Newtons second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary?
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A. II, IV, V

B. I, II, III

C. II, III, V

D. I, II, V

6065. Which is required in an insulating refractory ?
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A. High thermal conductivity

B. Low porosity

C. Both A. and B.

D. Neither A. nor B.

6066. Air vessel fitted to a reciprocating pump____________________?
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A. Results in non-uniform discharge

B. Increases the work done

C. Causes cavitation

D. Decreases the work done

6067. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?
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A. 11.8 m

B. 11 m

C. 30 m

D. 10 m

6068. Which of the following equations is valid for laminar flow of a fluid through packed bed ?
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A. Fanning equation

B. Blake-Plummer equation

C. Hagen-Poiseuille equation

D. Kozeny Karman equation

6069. Pressure co-efficient is the ratio of pressure forces to __________________________ forces?
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A. Gravity

B. None of these

C. Viscous

D. Inertial

6070. Spalling tendency of refractories is reduced by increasing its_________________?
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A. Thermal conductivity

B. Strength

C. Specific gravity

D. Porosity

6071. With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________________?
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A. Unpredictable

B. Decrease

C. Remain same

D. Increase

6072. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
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A. High thermal conductivity

B. None of these

C. Non-wetting characteristic

D. High crushing strength

6073. Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?
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A. Corundum

B. Thoria

C. Beryllia

D. Carborundum

6074. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?
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A. 90

B. 80

C. 70

D. 55

6075. Forces acting on a particle settling in fluid are _____________ forces?
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A. Gravitational & buoyant

B. Centrifugal & drag

C. External, drag & viscous

D. Gravitational or centrifugal buoyant drag

6076. Potential flow is characterised by the___________________?
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A. One in which dissipation of mechanical energy into heat occurs

B. Irrotational and frictionless flow

C. Irrotational and frictional flow

D. Formation of eddies within the stream

6077. Fusion point of a basic refractory material is__________________?
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A. Not affected by the addition of acid oxides

B. Always less than 1000C

C. Increased by the addition of acid oxides

D. Reduced by the addition of acid oxides

6078. Fireclay refractories____________________?
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A. Shrink during firing

B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming

C. Are not resistant to the action of basic slags

D. ible aluminates silicates etc

E. All A., B. and C.

6079. The highest melting pure oxide (m.p. > 3000C)is___________________?
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A. Beryllia

B. Zirconia

C. Alumina

D. Thoria

6080. In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes_______________?
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A. More than liquid vapor pressure

B. More than atmospheric pressure

C. Less than liquid vapor pressure

D. Less than atmospheric pressure

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