Chemical Engineering MCQs

Page No. 345

______________ resins are produced by the condensation polymerisation of formaldehyde with urea or melamine?


aEpoxy


bAmino


cAlkyd


dPhenolic


View Answer Amino

Condensation polymerisation of _____________ produces Bakelite?


aPropylene


bPhenol & formaldehyde


cPhenol & acetaldehyde


dUrea & formaldehyde


View Answer Phenol & formaldehyde

Polystyrene is a ____________ plastic at room temperature?


aDuctile


bBrittle


cMalleable


dNone of these


View Answer Brittle

Pick out the wrong statement ?


aThe mole fraction of solute is directly proportional to the molality of a ‘dilute’ solution


bFor a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is nonlinear in the case of steady state unimolal unidirectional diffusion


cAzeotropes obey Raoult’s law at all temperature


dThe relative volatility of a binary mixture at the Azeotropic composition is 1



Pick out the wrong statement ?


aMagnetic separation method can be employed to treat both dry & wet ores


bReduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size


cGyratory crusher is used for coarse crushing


dScreens are of stationary, moving and vibratory types



Pick out the wrong statement?


aCumulative analysis for determining surface area is preferred over differential analysis, because of the assumption that “all particles in a simple fraction equal in size” is not needed for cumulative analysis unlike differential analysis


bA gate diagram is a plot of cumulative percent by weight undersize vs. the reciprocal of diameter, in which the area beneath the curve represents the surface


cCapacity of crusher in choke feeding is increased


dRolling of pebbles/balls from top to bottom of the heap in tumbling mills is called ‘cascading and throwing of the balls through the air to the toe of the heap is called ‘cataracting’



Pick out the wrong statement ?


aFor the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant


bCake resistance is independent of the pressure drop


cCrushing of explosive materials are done by employing dry-grinding


dGyratory crusher is a coarse crusher



Pick out the wrong statement pertaining to the turbine agitator ?


aRecommended peripheral speed for the turbine agitator is 200-250 metres/minute


bPitched blade turbine agitator gives only radial flow with complete absence of the axial flow


cGenerally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter)


dTurbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used



Pick out the correct statement?


aAngle of repose is always greater than the angle of slide


bA hopper is a small bin with a sloping bottom


cA silo is a short height vessel of very large diameter used for the storage of high volatile matter coal


dPine oil is used as a ‘modifying agent’ (for activating or depressing the adsorption of filming agents) in froth floatation process



Pick out the correct statement ?


aPlastic chips are called non-cohesive solids


bKick’s crushing law is, P/m = K . ln (D̅ sa/D̅ sb)


cCommunition is a generic term for size enlargement operation


dEnergy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called ‘Work index’



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