For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Chemical Reaction Engineering
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Film diffusion

Either A, B or C

Diffusion through ash layer

Chemical reaction

Film diffusion

Either A, B or C

Diffusion through ash layer

Chemical reaction

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Chemical Reaction Engineering
In a reversible reaction, a catalyst increases the rate of forward reaction

To a greater extent than that of the backward reaction

And decreases that of the backward reaction

Only

And the backward reaction equally

To a greater extent than that of the backward reaction

And decreases that of the backward reaction

Only

And the backward reaction equally

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Chemical Reaction Engineering
The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from

L.0 to 10⁻⁸

None of these

0.1 to 0.9

L.l.to 10²

L.0 to 10⁻⁸

None of these

0.1 to 0.9

L.l.to 10²

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Chemical Reaction Engineering
When a catalyst increases the rate of chemical reaction, the rate constant

Remains constant

Decreases

Increases

Becomes infinite

Remains constant

Decreases

Increases

Becomes infinite

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Chemical Reaction Engineering
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by

None of these

Reaction

External mass transfer

Diffusion within the pellet

None of these

Reaction

External mass transfer

Diffusion within the pellet

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Chemical Reaction Engineering
A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m³ ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = - 40kJ/mole; ρ = 1000kg/m³ CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is

1kW

4kW

5/3 kW

2/3 kW

1kW

4kW

5/3 kW

2/3 kW

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Chemical Reaction Engineering

Chemical Reaction Engineering In a reversible reaction, a catalyst increases the rate of forward reaction

Chemical Reaction Engineering The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from

Chemical Reaction Engineering When a catalyst increases the rate of chemical reaction, the rate constant

Chemical Reaction Engineering A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by

Chemical Reaction Engineering
In a reversible reaction, a catalyst increases the rate of forward reaction

Chemical Reaction Engineering
The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from

Chemical Reaction Engineering
When a catalyst increases the rate of chemical reaction, the rate constant

Chemical Reaction Engineering
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by