MCQOPTIONS
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MCQOPTIONS
This section includes 119 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The effect of increasing pressure on the gaseous equilibrium of the reaction 2 X +3 Y 3 X +2 Y indicates that |
| A. | pressure has no effect. |
| B. | backward reaction is favoured. |
| C. | forward reaction is favoured. |
| D. | none of these. |
| Answer» B. backward reaction is favoured. | |
| 102. |
For reactions in parallel viz A P (desired product) and A Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a |
| A. | batch reactor is preferred over a single CSTR for high yield. |
| B. | tubular reactor is preferred over a single CSTR for high yield. |
| C. | both (a) and (b). |
| D. | single CSTR is the most suitable. |
| Answer» D. single CSTR is the most suitable. | |
| 103. |
For a gaseous phase reaction, rate of reaction is equal to K . C A . C B . If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times. |
| A. | 8 |
| B. | 16 |
| C. | 1/8 |
| D. | 1/16 |
| Answer» C. 1/8 | |
| 104. |
What is the Thiele modulus of the solid catalysed first order reaction, , if the pore diffusion offers negligible resistance to reaction ? |
| A. | < 5 |
| B. | < 0.5 |
| C. | > 1 |
| D. | 5 |
| Answer» C. > 1 | |
| 105. |
At a given temperature, K 1 , K 2 and K 3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH 4 (g) + H 2 O(g) CO(g) + 3H 2 (g), CO(g) + H 2 O(g) CO 2 (g) + H 2 (g) CH 4 (g) + 2H 2 O(g) CO 2 (g) + 4H 2 (g) Then K 1 , K 2 and K 3 are related as: |
| A. | K 3 = K 1 . K 2 |
| B. | K 3 = ( K 1 . K 2 ) 0.5 |
| C. | K 3 ( K 1 + K 2 )/2 |
| D. | K 3 = ( K 1 . K 2 ) 2 |
| Answer» B. K 3 = ( K 1 . K 2 ) 0.5 | |
| 106. |
Unreacted core model' represents the reaction involving |
| A. | combustion of coal particles. |
| B. | roasting of sulphide ores. |
| C. | manufacture of carbon disulphide from elements. |
| D. | none of these. |
| Answer» C. manufacture of carbon disulphide from elements. | |
| 107. |
At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R? |
| A. | 1.6 |
| B. | 2 |
| C. | 2.24 |
| D. | 2.5 |
| Answer» E. | |
| 108. |
A first order irreversible reaction, A B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors. |
| A. | both conversion as well as concentration are same |
| B. | conversion in both will be the same but concentrations will be different |
| C. | both the conversion as well as concentrations will be different |
| D. | none of these. |
| Answer» C. both the conversion as well as concentrations will be different | |
| 109. |
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e ., N 2 + 3H 2 2NH 3 . |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | unpredictable from the data |
| Answer» B. decreases | |
| 110. |
The dimensions of rate constant for reaction 3 A B are (l/gm mole)/min. Therefore the reaction order is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 111. |
For the irreversible elementary reactions in parallel viz , the rate of disappearance of ' X ' is equal to |
| A. | C A ( K 1 + K 2 ) |
| B. | C A ( K 1 + K 2 )/2 |
| C. | C A . K 1 /2 |
| D. | C A . K 2 /2 |
| Answer» B. C A ( K 1 + K 2 )/2 | |
| 112. |
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. | |
| 113. |
The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is |
| A. | 8987°K |
| B. | 9210°K |
| C. | 8764°K |
| D. | 8621°K |
| Answer» C. 8764°K | |
| 114. |
In a consecutive reaction system when E 1 is much greater than E 2 , the yield of B increases with the |
| A. | increase of temperature. |
| B. | decrease of temperature. |
| C. | increase in initial concentration of A . |
| D. | decrease in initial concentration of A . |
| Answer» B. decrease of temperature. | |
| 115. |
For a reaction of the type, , the rate of reaction (- r x ) is given by |
| A. | ( K 1 + K 1 ) C X |
| B. | ( K 1 + K 2 + K 3 ) C X |
| C. | K 1 C V - K 2 C X |
| D. | ( K 1 - K 2 ) C X |
| Answer» D. ( K 1 - K 2 ) C X | |
| 116. |
6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO 2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ? |
| A. | 100% |
| B. | 95% |
| C. | 75% |
| D. | 20% |
| Answer» C. 75% | |
| 117. |
For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times. |
| A. | 8 |
| B. | 12 |
| C. | 16 |
| D. | 32 |
| Answer» D. 32 | |
| 118. |
What is the order of a chemical reaction, , if the rate of formation of ' C ', increases by a factor of 2.82 on doubling the concentration of ' A ' and increases by a factor of 9 on trebling the concentration of ' B '? |
| A. | 7/2 |
| B. | 7/4 |
| C. | 5/2 |
| D. | 5/4 |
| Answer» B. 7/4 | |
| 119. |
The fractional volume change of the system for the isothermal gas phase reaction, A 3 B , between no conversion and complete conversion is |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |