MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Reaction Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If weight of all solids in the reactor is 300kg and the feed rate of solids is ( frac{50kg}{hr}, ) then the mean residence time(in hrs) of a material of a given size for mixed flow of a mixture of sizes of unchanging size particles is ____ |
| A. | 7 |
| B. | 6 |
| C. | 4 |
| D. | 3 |
| Answer» C. 4 | |
| 2. |
For mixed flow of a mixture of sizes of unchanging size particles, the mean residence time of a material of a given size is ____ |
| A. | = ( frac{Weight , of , all , solids , in , the , reactor}{Feed , rate , of , solids , to , the , reactor} ) |
| B. | = ( frac{Feed , rate , of , solids , to , the , reactor}{Weight of all solids in the reactor} ) |
| C. | = ( frac{Weight , of , all , solids , in , the , reactor}{Reactant , concentration} ) |
| D. | = ( frac{Reactant , concentration}{Weight , of , all , solids , in , the , reactor} ) |
| Answer» B. = ( frac{Feed , rate , of , solids , to , the , reactor}{Weight of all solids in the reactor} ) | |
| 3. |
If ( frac{ }{t}= frac{1}{3}, ) average conversion for a particle B of constant size in a mixed flow reactor for chemical reaction controlling is ____ |
| A. | 0.92 |
| B. | 0.98 |
| C. | 0.75 |
| D. | 0.76 |
| Answer» B. 0.98 | |
| 4. |
If ( frac{ }{t} ) = 0.5, average conversion for a particle B of constant size in a mixed flow reactor for film resistance controlling is ____ |
| A. | 0.45 |
| B. | 0.38 |
| C. | 0.536 |
| D. | 0.743 |
| Answer» D. 0.743 | |
| 5. |
For mixed flow of particles containing a single unchanging size and uniform gas composition, the fraction unconverted for chemical reaction controlling is ____ |
| A. | ( int_0^ )(1- ( frac{t}{ } ))<sup>3</sup> ( frac{e}{t}^ frac{-t}{t} ) dt |
| B. | ( int_0^ )(1- ( frac{t}{ } ))<sup>2</sup> ( frac{e}{t}^ frac{-t}{t} ) dt |
| C. | ( int_0^ )(1- ( frac{t}{ } )) ( frac{e}{t}^ frac{-t}{t} ) dt |
| D. | ( int_0^ )(1- ( frac{t}{ } ))<sup>0.5</sup> ( frac{e}{t}^ frac{-t}{t} ) dt |
| Answer» B. ( int_0^ )(1- ( frac{t}{ } ))<sup>2</sup> ( frac{e}{t}^ frac{-t}{t} ) dt | |
| 6. |
For mixed flow of particles containing a single unchanging size and uniform gas composition, the fraction unconverted for film resistance controlling is ____ |
| A. | ( int_0^ )(- ( frac{t}{ } )) ( frac{e}{t}^ frac{-t}{t} ) dt |
| B. | ( int_0^ )(1 ( frac{t}{ } )) ( frac{e}{t}^ frac{-t}{t} ) dt |
| C. | ( int_0^ )(1 ( frac{t}{ } ))dt |
| D. | ( int_0^ )(1 ( frac{t}{ } )) ( frac{e}{t}^ frac{-t}{t} ) dt |
| Answer» C. ( int_0^ )(1 ( frac{t}{ } ))dt | |
| 7. |
If ( overline{X_{Ri}} ) is the mean conversion of a reactant of particle size Ri, Rm is the particle of maximum size in the feed and F(Ri) is the fraction of Ri fed to the reactor, then the mean conversion of solids of a particular size i leaving a plug flow reactor converting a mixture of particles of varying sizes is ____ |
| A. | ( overline{X_{(B)Ri}} = _{R( )}^{Rm} )[1- X<sub>(B)Ri</sub>] ( frac{F(Ri)}{F} ) |
| B. | 1- ( overline{X_{(B)Ri}} = _{R( )}^{Rm} )[ X<sub>Ri</sub>] ( frac{F(Ri)}{F} ) |
| C. | 1- ( overline{X_{(B)Ri}} = _{R( )}^{Rm} )[1-X<sub>(B)Ri</sub>] F (Ri) |
| D. | 1- ( overline{X_{(B)Ri}} = _{R( )}^{Rm} )[1-X<sub>(B)Ri</sub>] ( frac{F(Ri)}{F} ) |
| Answer» E. | |
| 8. |
Which of the following does not control the design of fluid solid reactor? |
| A. | Reaction kinetics for single particles |
| B. | Density of fluid being treated |
| C. | Size distribution of solids |
| D. | Flow patterns of solids and fluid |
| Answer» C. Size distribution of solids | |
| 9. |
Which of the following does not provide plug flow of Solid fluids? |
| A. | Fluidised bed reactor |
| B. | Countercurrent flow in blast furnaces |
| C. | Crossflow in moving belt |
| D. | Concurrent flow in driers |
| Answer» B. Countercurrent flow in blast furnaces | |
| 10. |
State true or false.
|
| A. | True |
| B. | False |
| Answer» B. False | |