Online Chemical Engineering Test - Chemical Reaction Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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A reactor is generally termed as an autoclave, when it is a

high pressure batch reactor.

atmospheric pressure tank reactor.

high pressure tubular reactor.

atmospheric pressure CSTR.

[#]

A batch reactor is suitable for

achieving cent percent conversion of reactants into products.

large scale gaseous phase reactions.

liquid phase reactions.

obtaining uniform polymerisation products in highly exothermic reactions.

[#]

A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length

decreases.

increases.

is at the highest allowable temperature throughout.

first increases and then decreases.

[#]

An autothermal reactor is

most suitable for a second order reaction.

most suitable for a reversible reaction.

completely self-supporting in its thermal energy requirements.

isothermal in nature.

[#]

Variables affecting the rate of homogeneous reactions are

pressure and temperature only.

temperature and composition only.

pressure and composition only.

pressure, temperature and composition.

[#]

The rate of the chemical reaction A

B doubles as the concentration of A i.e.., C_A is doubled. If rate of reaction is proportional to C_Aⁿ, then what is the value of n for this reaction ?

0.5

[#]

In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.

non-catalytic homogeneous

non-catalytic heterogeneous

catalytic homogenous

catalytic heterogeneous

[#]

Pick out the wrong statement.

The integral method of analysing kinetic data is used when the data is scattered.

The differential method of analysing kinetic data requires more accurate or larger amounts of data.

When the reaction rate is independent of temperature, the reaction is said to be of zero order.

The ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and for all positive reaction orders.

[#]

Which of the following is used for calcination of limestone and dolomite in industrial practice ?

Fluidised bed reactor

Moving bed reactor

Fixed bed reactor

None of these

[#]

10.

Slurry reactors are characterised by the

lack of intraparticle diffusion resistance.

presence of two mobile phases.

both (a) and (b).

neither (a) nor (b).

[#]

11.

With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will

increase

decrease

remain same

data in insufficient; can't be predicted

[#]

12.

Transition state theory gives the rate constant as

K α e^-E/RT

K α e^E/RT

K α T . e^-E/RT

[#]

13.

The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to

1/m

m²

[#]

14.

Pick out the wrong statement.

A catalyst does not alter the final position of equilibrium in a reversible reaction.

A catalyst initiates a reaction.

A catalyst is specific in reaction.

A catalyst remains unchanged in chemical composition at the end the reaction.

[#]

15.

For any reaction, we may write conversion as a function of

time

temperature

concentration

all (a), (b) & (c)

[#]

16.

Velocity of a chemical reaction

decreases with increase in temperature.

increases with increase of pressure of reactants for all reactions.

decreases with increase of reactant concentration.

none of these.

[#]

17.

With increase in K₂/K₁ in case of a unimolecular type elementary reactions

, the fractional yield of 'R' in mixed reactor (for a given conversion of 'A')

decreases

increases

increases linearly

remains same

[#]

18.

The concentration of A in a first order reaction, A

B, decreases

linearly with time.

exponentially with time.

very abruptly towards the end of the reaction.

logarithmically with time.

[#]

19.

The effectiveness factor for large value of Thiele modulus (LK/D₁) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D₁ = diffusion co-efficient, cm²/second)

L(K/D₁)

1/(LK/D₁)

∞

[#]

20.

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

ideal plug flow

bypass

dead zone

chanelling

[#]

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