Chemical Engineering MCQs

Page No. 503

In a _____________ riveted joint, the number of rivets decreases from the innermost row to the outermost row?


aChain

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bDiamond

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cZig-zag

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dNone of these

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View Answer Diamond

The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always ?


a1

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b< 1

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c> 1

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dEqual to the order of reaction

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View Answer > 1

Pick out the wrong statement ?


aIn a flanged and standard dished head, the crown radius is ≤ shell outside diameter

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bIn a flanged and shallow dished head, the crown radius is > shell outside diameter

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cFlat head covers are most suitable for larger vessels operating at very high pressure

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dFlanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

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Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?


a1.5-2.5

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b3.5-5.5

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c7.5-10.0

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d10-15

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View Answer 1.5-2.5

Filtration rate is affected by the________________?


aPressure drop across the cake & filter medium

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bCake & filter medium resistance

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cArea of filtering surface & the viscosity of filtrate

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dAll A., B. and C.

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View Answer All A., B. and C.

_____________ shaped roof is the most commonly used roof for cylindrical storage tanks?


aConical

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bFlat

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cDome

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dUmbrella

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View Answer Conical

The minimum shell thickness for tank ≤ 15 metres diameter is limited to _______________ mm, for reasons of elastic stability?


a2

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b5

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c10

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d15

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View Answer 5

A ‘rupture disc’ is provided in chemical equipments as an accessory meant for ___________________?


aRelieving excess pressure

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bCreating turbulence

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cEnhancing mixing rate

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dAvoiding vortex formation

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Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ζ = yield strength and E = modulus of elasticity) ?


aE

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bζ

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cζ/E

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dE/ζ

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View Answer ζ/E

Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?


a250

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b450

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c650

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d750

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View Answer 650

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