Elements of Chemical Engineering Reaction Online test - Set 18 - ObjectiveBooks
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Elements of Chemical Engineering Reaction Online test - Set 18

Practice Test: Question Set - 18


1. 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

2. A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of:
    (A) 7
    (B) 6
    (C) 3
    (D) 7/3

3. For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
    (A) Film diffusion
    (B) Diffusion through ash layer
    (C) Chemical reaction
    (D) Either (a), (b) or (c)

4. Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.
    (A) Dynamic steady
    (B) Static steady
    (C) Dynamic unsteady
    (D) None of these

5. Pick out the wrong statement pertaining to space velocity of flow reactors.
    (A) The unit of space velocity is (time)-1
    (B) The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour
    (C) The space velocity of 3 hr-1 means that one third reactor volume of feed at specified conditions are being fed into the reactor
    (D) None of these

6. Kinetics of a catalytic reaction can be best studied on a/an __________ reactor.
    (A) Mixed
    (B) Integral (plug flow)
    (C) Differential (flow)
    (D) Either (a), (b) and (c)

7. The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))
    (A) 400
    (B) 500
    (C) 600
    (D) 1000

8. In a continuous flow stirred tank reactor, the composition of the exit stream
    (A) Is same as that in the reactor
    (B) Is different than that in the reactor
    (C) Depends upon the flow rate of inlet stream
    (D) None of these

9. Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is
    (A) (atm)-1
    (B) (hr)-1
    (C) (atm)-1.(hr)-1
    (D) atm.(hr)-1

10. A space velocity of 5 hr-1 means that
    (A) Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
    (B) After every 5 hours, reactor is being filled with the feed
    (C) Cent per cent conversion can be achieved in at least 5 hours
    (D) A fixed conversion of a given batch of feed takes 5 hours

11. Half life period of a chemical reaction is
    (A) The time required to reduce the concentration of the reacting substance to half its initial value
    (B) Half of the space time of a reaction
    (C) Half of the residence time of a reaction
    (D) None of these

12. Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.
    (A) Highest possible
    (B) Lowest possible
    (C) Intermediate
    (D) Room

13. Which of the following is the most suitable for very high pressure gas phase reaction?
    (A) Batch reactor
    (B) Tubular flow reactor
    (C) Stirred tank reactor
    (D) Fluidized bed reactor

14. The order of the chemical reaction as shown in the bellow figure, whose rate equation is given as -rA KCA2CB is
    (A) 0
    (B) 1
    (C) 2
    (D) 3

15. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
    (A) Is independent of pressure
    (B) Increases with pressure
    (C) Decreases with pressure
    (D) Increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction

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