40 TOP CHEMICAL REACTION Engineering Online Test – Multiple Choice Questions and Answers 1. ‘Unreacted core model’ represents the reaction involving combustion of coal particles roasting of sulphide ores manufacture of carbon disulphide from elements none of these 2. A photochemical reaction is __________ light used to convert heat energy into accompanied with emission of catalysed by initiated by 3. When a catalyst increases the rate of forward reaction, the value of rate constant increases decreases remain same becomes infinite 4. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor tubular flow stirred tank batch fixed bed 5. In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds series parallel auto catalytic catalytic 6. In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation isothermal adiabatic non-adiabatic none of these 7. The rate constant of a chemical reaction increases by increasing the temperature pressure reactant’s concentration none of these 8. Pick out the wrong statement In a semi-batch reactor, one reactant is charged batchwise, while the other reactant is fed continuously In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time In a continuous flow reactor, both the reactants and the products flow out continuously In a continuous flow reactor, uniform concentration can not be maintained throughout the vessel even in a well agitated system 9. Pick out the correct statement A lower temperature favours the reaction of lower activation energy Pore volume and porosity of a catalyst is measured by Brunaver-Emmet-Teller (BET) technique The dispersion number for a reactor/vessel is uL/D The rate controlling step in a reaction involving many steps is the fastetst step 10. A batch reactor is characterised by variation in extent of reaction and properties of the reaction mixture with time constant residence time very low conversion variation in reactor volume Loading … Question 1 of 10
