Chemical Engineering MCQs

Page No. 558

A space time of 3 hours for a flow reactor means that___________________?


aThe time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

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bThree reactor volumes of feed can be processed every hour

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cIt takes three hours to dump the entire volume of the reactor with feed

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dConversion is cent per cent after three hours

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For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by___________________?


a(K1 + K1) CX

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b(K1 + K2+K3) CX

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cK1CV – K2CX

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d(K1 – K2) CX

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View Answer K1CV – K2CX

A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1; (ΔH) = – 40kJ/mole; ρ = 1000kg/m3 CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is_________________?


a2/3 kW

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b1 kW

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c5/3 kW

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d4 kW

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View Answer 5/3 kW

If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?


at ∝ 1/an

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bt ∝ 1/an – 1

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ct ∝ 1/an + 1

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dt ∝ an

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View Answer t ∝ 1/an – 1

A reactor is generally termed as an autoclave, when it is a_____________________?


aHigh pressure batch reactor

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bAtmospheric pressure tank reactor

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cHigh pressure tubular reactor

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dAtmospheric pressure CSTR

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For an autocatalytic reactor, the suitable reactor set up is__________________?


aP.F. reactors in series

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bCSTR in series

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cCSTR followed by P.F. reactor

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dP.F. reactor followed by CSTR

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Which of the following factors control the design of a fluid-solid reactor ?


aReaction kinetics for single particle

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bSize distribution of solids being treated

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cFlow patterns of solids and fluid in the reactor

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dAll A., B. and C.

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View Answer All A., B. and C.

______________ explains the mechanism of catalysis?


aActivated complex theory

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bCollision theory

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cThermodynamics

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dNone of these

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If Thiele modulus is ________________, then the pore diffusion resistance in a catalyst may be considered as negligible?


a0

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b∞

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c< 0.5

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d> 0.5

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View Answer < 0.5

Rate of a chemical reaction is not influenced by the__________________?


aCatalyst

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bTemperature

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cReactants concentration

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dNumber of molecules of reactants taking part in a reaction

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