Question 61 : Fluid flow in a real packed bed can be approximated as __________ model.
1. mixed flow
2. plug flow
3. tank in series
4. dispersion
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Question 62 : For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by
1. a dirac delta function
2. none of the above
3. a ramp function.
4. a step function.
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Question 63 : For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.
1. τ = θ , when the fluid density changes in the reactor.
2. τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant.
3. τ and θ are always equal.
4. τ = θ , for a non-isothermal reactor.
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Question 64 : A plug-flow reactor is characterised by
1. presence of lateral mixing.
2. constant composition and temperature of reaction mixture.
3. high capacity.
4. presence of axial mixing.
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Question 65 : The rate at which a chemical substance reacts is proportional to its
1. equivalent weight
2. molecular weight
3. active mass
4. none of these
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Question 66 : Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?
1. Adsorption isobar
2. Langmuir adsorption isotherm
3. None of these
4. Freundlich adsorption isotherm
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Question 67 : In autocatalytic reactions,
1. catalysts have very high selectivity.
2. one of the products acts as a catalyst.
3. no catalyst is used.
4. one of the reactants acts as a catalyst.
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Question 68 : What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?
1. third
2. second
3. first
4. zero
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Question 69 : Study of chemical kinetics is the easiest in the case of __________ reactions.
1. reversible
2. irreversible
3. surface
4. side
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Question 70 : A typical example of an exothermic reversible reaction conducted at high pressure in industry is
1. methanol synthesis.
2. reformation of methane.
3. dehydration of ethanol.
4. polymerisation of ethylene.
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