MCQOPTIONS
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MCQOPTIONS
This section includes 1443 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1101. |
In flow reactors, the performance equations interrelate the rate of reaction to the |
| A. | Feed rate |
| B. | Reactor volume |
| C. | Extent of reaction |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1102. |
A multiple reaction may be classified as a __________ reaction. |
| A. | Consecutive or side |
| B. | Parallel or side |
| C. | Mixed |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1103. |
When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield. |
| A. | Is greater than |
| B. | Is smaller than |
| C. | Equals |
| D. | Can be either greater or smaller than (depends on the type of reaction) |
| Answer» D. Can be either greater or smaller than (depends on the type of reaction) | |
| 1104. |
Molecularity of a reaction |
| A. | Is always equal to the overall order of reaction |
| B. | May not be equal to the order of reaction |
| C. | Can’t have a fractional value |
| D. | Both (B) and (C) |
| Answer» E. | |
| 1105. |
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature? |
| A. | Time |
| B. | Useful volume of the tank |
| C. | Diameter of the reactor |
| D. | None of these |
| Answer» B. Useful volume of the tank | |
| 1106. |
A balanced chemical reaction equation conforms to the law of |
| A. | Conservation of mass |
| B. | Avogadro’s hypothesis |
| C. | Gaseous volumes |
| D. | None of these |
| Answer» B. Avogadro’s hypothesis | |
| 1107. |
Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in |
| A. | Blood |
| B. | Saliva |
| C. | Intestine |
| D. | Gland |
| Answer» C. Intestine | |
| 1108. |
Which of the following chemical reactions will be favoured by low pressure? |
| A. | 2HI ⇌ H2 + I2 |
| B. | N2O2 ⇌ 2NO2 |
| C. | N2 + O2 ⇌ 2NO |
| D. | None of these |
| Answer» C. N2 + O2 ⇌ 2NO | |
| 1109. |
A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction. |
| A. | Catalytic |
| B. | Autocatalytic |
| C. | Photochemical |
| D. | None of these |
| Answer» C. Photochemical | |
| 1110. |
An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is |
| A. | 0.80 |
| B. | 1.33 |
| C. | 1.60 |
| D. | 2.67 |
| Answer» D. 2.67 | |
| 1111. |
When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is |
| A. | > 1 |
| B. | < 1 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 1112. |
The performance of a cascade of CSTR's can be improved by adding |
| A. | A P.F. reactor in series |
| B. | A P.F. reactor in parallel |
| C. | More CSTRs in series |
| D. | More CSTRs in parallel |
| Answer» D. More CSTRs in parallel | |
| 1113. |
The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises from 10 to 100°C. |
| A. | 256 |
| B. | 512 |
| C. | 112 |
| D. | 612 |
| Answer» C. 112 | |
| 1114. |
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield? |
| A. | Large reactor followed by smaller one |
| B. | Smaller reactor followed by larger one |
| C. | Either of the arrangement (A) or (B) will give the same yield |
| D. | Data insufficient, cant be predicted |
| Answer» D. Data insufficient, cant be predicted | |
| 1115. |
An autothermal reactor is |
| A. | Most suitable for a second order reaction |
| B. | Most suitable for a reversible reaction |
| C. | Completely self-supporting in its thermal energy requirements |
| D. | Isothermal in nature |
| Answer» D. Isothermal in nature | |
| 1116. |
In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) |
| A. | A |
| B. | N |
| C. | A + N |
| D. | A - N |
| Answer» D. A - N | |
| 1117. |
Sulphuric acid is used as a catalyst in the |
| A. | Hydrogenation of oils |
| B. | Gas phase oxidation of SO2 in chamber process |
| C. | Alkylation of hydrocarbons |
| D. | None of these |
| Answer» D. None of these | |
| 1118. |
A trickle bed reactor is the one, which |
| A. | Has altogether three streams either entering or leaving |
| B. | Processes three reactants at different flow rates |
| C. | Processes three reactants with same flow rate |
| D. | Employs all the three phases (i.e. solid, liquid and gas) |
| Answer» E. | |
| 1119. |
In a chemical reaction, __________ are conserved. |
| A. | Ions |
| B. | Masses |
| C. | Atoms |
| D. | Both (B) & (C) |
| Answer» E. | |
| 1120. |
The rate of reaction of a/an __________ reaction is not affected by temperature rise. |
| A. | Autocatalytic |
| B. | Photochemical |
| C. | Consecutive |
| D. | Zero order |
| Answer» C. Consecutive | |
| 1121. |
With decrease in temperature, the equilibrium conversion of a reversible endothermic reaction |
| A. | Decreases |
| B. | Increases |
| C. | Remain unaffected |
| D. | Increases linearly with temperature |
| Answer» B. Increases | |
| 1122. |
The energy balance equation over a tubular reactor under transient conditions is |
| A. | An ordinary non-linear differential equation |
| B. | An algebraic differential equation |
| C. | A linear partial differential equation |
| D. | A non-linear partial differential equation |
| Answer» D. A non-linear partial differential equation | |
| 1123. |
Ionic reactions occur in |
| A. | Solid state only |
| B. | Liquid state only |
| C. | Solutions |
| D. | Any state |
| Answer» D. Any state | |
| 1124. |
Exothermic reactions are best carried out in |
| A. | A CSTR |
| B. | CSTR in series |
| C. | A plug flow reactor followed by CSTR |
| D. | CSTR followed by a plug flow reactor |
| Answer» E. | |
| 1125. |
N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions. |
| A. | First |
| B. | Second |
| C. | Third |
| D. | Any |
| Answer» E. | |
| 1126. |
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the |
| A. | Reaction is elementary with a molecularity of 2 |
| B. | Molecularity of the reaction is 2, but the reaction may not be elementary |
| C. | Reaction may be elementary with molecularity of 2 |
| D. | Reaction is elementary but the molecularity may not be 2 |
| Answer» B. Molecularity of the reaction is 2, but the reaction may not be elementary | |
| 1127. |
Enzymes are destroyed, when the |
| A. | Temperature is very high |
| B. | Reactants concentration is very high |
| C. | Reactants concentration is very low |
| D. | Reaction rate is independent of the reactants concentration |
| Answer» B. Reactants concentration is very high | |
| 1128. |
Backmixing is most predominant in |
| A. | A well stirred batch reactor |
| B. | A plug-flow reactor |
| C. | A single CSTR |
| D. | CSTRs connected in series |
| Answer» D. CSTRs connected in series | |
| 1129. |
________ is the response curve for a step input signal from a reactor |
| A. | S-curve |
| B. | C-curve |
| C. | I-curve |
| D. | None of these |
| Answer» C. I-curve | |
| 1130. |
For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cx n , then what is the value of „n‟? |
| A. | 1/4 |
| B. | 2 |
| C. | 4 |
| D. | 16 |
| Answer» D. 16 | |
| 1131. |
An imbalanced chemical reaction equation is against the law of |
| A. | Multiple proportion |
| B. | Conservation of mass |
| C. | Constant proportion |
| D. | None of these |
| Answer» C. Constant proportion | |
| 1132. |
For a zero order chemical reaction, the |
| A. | Half life period is directly proportion to the initial concentration of the reactants |
| B. | Plot of products concentration with time is a straight line through the origin |
| C. | Products concentration increases linearly with time |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1133. |
An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is: |
| A. | Maximum at the inlet of the reactor |
| B. | Maximum at the exit of the reactor |
| C. | Maximum at the centre of the reactor |
| D. | Constant throughout the reactor |
| Answer» B. Maximum at the exit of the reactor | |
| 1134. |
Which of the following is a controlling factor in very fast heterogeneous reaction? |
| A. | Heat and mass transfer effects |
| B. | Pressure |
| C. | Temperature |
| D. | Composition of reactant |
| Answer» B. Pressure | |
| 1135. |
The decomposition of A into B is represented by the exothermic reaction, A ⇌ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction. |
| A. | At high P and high T |
| B. | At low P and high T |
| C. | At low P and low T |
| D. | At high P and low T |
| Answer» D. At high P and low T | |
| 1136. |
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole. |
| A. | 100 |
| B. | 1000 |
| C. | 10000 |
| D. | 100000 |
| Answer» C. 10000 | |
| 1137. |
The excess energy of the reactants required to dissociate into products is known as the __________ energy |
| A. | Thermal |
| B. | Activation |
| C. | Threshold |
| D. | Binding |
| Answer» C. Threshold | |
| 1138. |
In the reversible reaction of the type, A + B ⇌ AB, in general |
| A. | Both forward and backward reactions will be exothermic |
| B. | Neither of the reactions will be endothermic |
| C. | The combination reaction will be exothermic, while the dissociation reaction will be endothermic |
| D. | The combination reaction will be endothermic, while the dissociation reaction will be exothermic |
| Answer» D. The combination reaction will be endothermic, while the dissociation reaction will be exothermic | |
| 1139. |
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order. |
| A. | Zero |
| B. | First |
| C. | Second |
| D. | None of these |
| Answer» D. None of these | |
| 1140. |
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption. |
| A. | Physical |
| B. | Chemical |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» C. Both (A) and (B) | |
| 1141. |
Which of the following factors control the deactivation of a porous catalyst pellet? |
| A. | Decay reactions |
| B. | Pore diffusion |
| C. | Form of surface attack by poison |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1142. |
A backmix reactor |
| A. | Is same as plug-flow reactor |
| B. | Is same as ideal stirred tank reactor |
| C. | Employs mixing in axial direction only |
| D. | Is most suitable for gas phase reaction |
| Answer» C. Employs mixing in axial direction only | |
| 1143. |
Carbon particles accumulated on the catalyst used in the gas oil cracking lies in the category of __________ poison. |
| A. | Deposited |
| B. | Chemisorbed |
| C. | Selectivity |
| D. | Stability |
| Answer» B. Chemisorbed | |
| 1144. |
A batch reactor is suitable for |
| A. | Achieving cent percent conversion of reactants into products |
| B. | Large scale gaseous phase reactions |
| C. | Liquid phase reactions |
| D. | Obtaining uniform polymerisation products in highly exothermic reactions |
| Answer» D. Obtaining uniform polymerisation products in highly exothermic reactions | |
| 1145. |
For an ideal plug flow reactor, the value of Peclet number is |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | ∞ |
| Answer» B. 1 | |
| 1146. |
Photochemical reaction rate does not depend significantly on temperature, because |
| A. | It is a reversible reaction |
| B. | It is an exothermic reaction |
| C. | The energy of reacting molecules exceeds the activation energy by absorption of light |
| D. | None of these |
| Answer» D. None of these | |
| 1147. |
In an ideal mixed reactor (at steady state), the |
| A. | Space time is equivalent to holding time for constant density systems |
| B. | Composition throughout the reactor remains same |
| C. | Exit stream has the same composition as the fluid within the reactor |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1148. |
The single parameter model proposed for describing non-ideal flow is the __________ model. |
| A. | Tank in series |
| B. | Dispersion |
| C. | Both (A) & (B) |
| D. | Neither (A) nor (B) |
| Answer» D. Neither (A) nor (B) | |
| 1149. |
The importance of diffusion in a catalyst are increased by |
| A. | Large catalyst particle size |
| B. | An active surface of the catalyst |
| C. | Small pore diameter |
| D. | All (A), (B) and (C) |
| Answer» E. | |
| 1150. |
A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is __________ seconds. |
| A. | 1 |
| B. | 3 |
| C. | 1/3 |
| D. | 32 |
| Answer» C. 1/3 | |