Chemical Engineering MCQs

Page No. 346

Pick out the wrong statement pertaining to the roll crushers?


aMaximum feed size determines the required roll diameter

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bFor hard material’s crushing, the reduction ratio should not exceed 4

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cBoth the rolls run necessarily at the same speed

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dReduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced

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View Answer Both the rolls run necessarily at the same speed

Pick out the wrong statement?


aRecycled coarse material to the grinder by a classifier is termed as circulating load

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bWear and tear in wet crushing is more than that in dry crushing of materials

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cSize enlargement (opposite of size reduction) is not a mechanical operation

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dA ‘dust catcher’ is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas

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View Answer Size enlargement (opposite of size reduction) is not a mechanical operation

Pick out the wrong statement?


aClose circuit grinding is more economical than open circuit grinding

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bCod oil, beef tallow or aluminium stearates are used as grinding aids in cement ‘industries’

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cThe equipment used for the removal of traces of solids from a liquid is called a classifier

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dSize enlargement is a mechanical operation exemplified by medicinal tablet making

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View Answer The equipment used for the removal of traces of solids from a liquid is called a classifier

Pick out the correct statement ?


aRemoval of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products

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bThe operating cost of shaking screen is more than that of a vibrating screen

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cScreen capacity does not depend upon the specific gravity of the minerals

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dAsphalt is best crushed using toothed roll crusher

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View Answer Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products

Pick out the wrong statement ?


aHammer crushers operate by impact action

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bStandard screens have circular opening

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cWith increase in mesh number of screens, their diameter in microns decreases

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d200 mesh screen has 200 openings per linear cm

✓


View Answer 200 mesh screen has 200 openings per linear cm

Pick out the correct statement?


aThe capacity and the effectiveness of a screen are the same

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bThe capacity and the effectiveness of screen are opposing factors

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cThe screening surface of a ‘reel’ (a revolving screen used in flour mills) is made of silk bolting cloth supported by wire mesh

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dBoth B. and C.

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View Answer Both B. and C.

Pick out the wrong statement ?


aFor a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank reactor provides higher overall selectivity

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bFor an ideal mixed reactor at steady state, the exit stream has the same composition as fluid within the reactor and the space time is equivalent to holding time for constant density system

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cPlug flow reactor (PFR) is always smaller than mixed reactor for all positive reaction orders for a particular duty

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dReaction rate does not decrease appreciably as the reaction proceeds in case of an autocatalytic reaction

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View Answer For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank reactor provides higher overall selectivity

Pick out the wrong statement ?


aFor the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR

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bTwo mixed reactors of unequal size are available for producing a specified product, formed by a homogenous second order reaction. To achieve maximum production rate, the smaller reactor should be placed in series before the larger reactor

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cArrhenius equation describing the effect of temperature on rate constant is given by, K = A.e-Ea/RT

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dThe mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is: CH3CHO + I2 → CH3I + HI + CO; slow CH3I + HI → CH4 + I2; fast Then the rate of disappearance of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst

✓


View Answer The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is: CH3CHO + I2 → CH3I + HI + CO; slow CH3I + HI → CH4 + I2; fast Then the rate of disappearance of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst

Pick out the correct statement ?


aA chemical reaction accompanied by absorption of heat is called an exothermic reaction

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bA chemical reaction accompanied by evolution of heat is called an endothermic reaction

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cThe rate constant for a first order reaction does not change on changing the concentration units

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dChemical equilibrium state is dynamic in nature

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View Answer The rate constant for a first order reaction does not change on changing the concentration units

Pick out the correct statement ?


aA catalyst speeds up the forward reaction but slows shown the reverse reaction

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bAddition of catalyst changes the equilibrium constant

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cPressure changes do not change the equilibrium concentrations

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dThe composition of equilibrium is changed by catalyst

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View Answer Pressure changes do not change the equilibrium concentrations

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