Chemical Engineering Mcqs

For a homogeneous reaction of nth order, the dimension of the rate constant is given by_________________?

(A) 1/(time)n
(B) (Concentration)1 – n/(time)
(C) (Concentration)n – 1/(time)
(D) None of these

Submitted By :Ali Uppal

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__________________?

(A) Diffusion within the pellet
(B) Reaction
(C) External mass transfer
(D) None of the above

Submitted By :Ali Uppal

The use of space time is preferred over the mean residence time in the design of a/an____________________?

(A) Batch reactor
(B) Ideal tubular-flow reactor
(C) Slurry reactor
(D) CSTR

Submitted By :Ali Uppal

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?

(A) Ideal plug flow
(B) Bypass
(C) Dead zone
(D) Channelling

Submitted By :Ali Uppal

Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?

(A) Proportional to
(B) Independent of
(C) Inversely proportional to
(D) Proportional to the square of

Submitted By :Ali Uppal

Fractional conversion _________________ for an exothermic reversible chemical reaction, when the temperature is maximum?

(A) Increases
(B) Remains unchanged
(C) Decreases
(D) Unpredictable from the data

Submitted By :Ali Uppal

For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?

(A) CSTR of volume V
(B) PFR of volume V
(C) CSTR of volume V/X
(D) PFR of volume V/X

Submitted By :Ali Uppal

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the _____________________?

(A) Equilibrium constant is infinite
(B) Fractional conversion of ‘A’ at equilibrium is unity
(C) Concentration of ‘A’ at equilibrium is zero
(D) All

Submitted By :Ali Uppal

Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is _____________ minutes?

(A) 18
(B) 24
(C) 6
(D) 12

Submitted By :Ali Uppal

The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is___________________?

(A) 0.5
(B) -0.5
(C) 1
(D) 1.5

Submitted By :Ali Uppal

Previous
First
....
261
262
263
264
265
....
811
Next