chemical engineering MCQs – Page 305

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 Review each marked answer and report any item that may be outdated or unclear.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
6081. In a fluidised bed reactor___________________?
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A. Segregation of the solids occurs

B. Temperature is more or less uniform

C. Temperature gradients are very high

D. Hot spots are formed

6082. A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by________________?
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A. Decreasing the size of the inlet pipe

B. Increasing the size of the inlet pipe

C. Lowering the pump position

D. Both B. and C.
6083. Fireclay bricks are not used in the _________________?
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A. Combustion chamber of B.F. stoves

B. Beehive coke oven

C. By-product coke oven walls

D. Coke oven regenerators

6084. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?
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A. Silica

B. Very low alumina

C. Fireclay

D. Dolomite

6085. Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?
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A. Pottery furnace

B. Gas retorts

C. Glass melting furnace

D. Crucibles

6086. In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?
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A. Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

B. Water discharge from a vertical vessel in which constant level is maintained

C. Water flow in the suction and discharge pipe of a reciprocating pump

D. Discharge of water by a centrifugal pump being run at a constant rpm

6087. Magnesite refractories are used for the construction of those furnaces, which are________________?
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A. Not required to resist the corrosive action of basic slag

B. Not subjected to fluctuation in temperature

C. Used for raising & maintaining high temperature

D. Both B. and C.
6088. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500C, its crushing strength may come down to as low as ______________ kg/cm2?
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A. 250

B. 450

C. 65

D. 150

6089. Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
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A. Crystalline magnesia

B. Zirconium sulphate

C. Silicon nitride

D. Silicon carbide
6090. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?
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A. 1.5

B. 0.5

C. 1

D. 2

6091. Which is the stable form of silica between 1470C and the melting point 1713C ?
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A. Tridymite

B. Cristobalite

C. Quartz

D. None of these

6092. Which of the following facilitates close control of flow of fluids ?
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A. Butterfly valve

B. Globe valve

C. Check valve

D. Gate valve

6093. 10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?
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A. Crushing strength

B. Refractoriness

C. Spalling resistance

D. Resistance to slag

6094. Which is not an acidic refractory ?
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A. High alumina refractory

B. Carbon black

C. Silica

D. Fireclay

6095. Which is an acidic refractory ?
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A. Magnesite

B. Fireclay

C. Chrome magnesite

D. Dolomite

6096. Which of the following is a Newtonian fluid ?
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A. Rubber latex

B. Sewage sludge

C. Non-colloidal solution

D. Quicksand

6097. One poise (unit of absolute/dynamic viscosity) is equivalent to one_____________________?
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A. gm/cm. sec

B. m2/sec

C. gm/cm2. sec

D. cm2/sec

6098. I.D. of 1/4? schedule 40 pipe is 0.364?. I.D. of a 1/2? schedule 40 pipe would be ______________ inch?
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A. 0.5

B. 0.474

C. 4.728

D. 0.622
6099. Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?
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A. 200-400

B. 500-1000

C. 100-150

D. 50-100

6100. Chromite refractories are used in_______________?
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A. Bottom of soaking pits

B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action

C. h each other

D. Both A. & B.

E. Neither A. and B.