Metallurgical Thermodynamics and Kinetics MCQs with Answers 2027

Q101

A recrystallisation process is 20% complete after 45 sec. and 85% complete after 75 sec. Assuming Avrami Kinetics, the value of Avrami exponent 'n' is

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Q102

Open question

Match the following:

Group 1	Group 2
P. Henry's law	1. Extensive Property
Q. Disorder	2. Chemical potential
R. Activity	3. Entropy
S. Enthalpy	4. Dilute solution

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Q103

Open question

The expression for work done at constant volume is

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Q104

Open question

Solution of nitrogen in liquid iron may be assumed to follow Sievert's law. Nitrogen content of liquid iron. at 1873K in equilibrium with 1 atm pressure of nitrogen is measured as 0.044 (mass %). What will be the equilibrium nitrogen content in liquid iron (mass%), if nitrogen pressure is reduced to 0.25 atm?

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Q105

Open question

Which one of the following statements about the order of a reaction is false?

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Q106

Open question

C(s) + CO₂(g) ⇋ 2CO (g) is an important reaction in iron making.
Given ΔH⁰₂₉₈= 172000 joules per mole of CO₂, which of the following conditions will favour the forward reaction?

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Q107

Open question

Two phases α and β are in thermodynamic equilibrium. If x and y are the only components present in the phase α and β and μ^j_i represents the chemical potential of component i in phase j, then the condition for equilibrium is

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Q108

Open question

At constant temperature and pressure, two phase α and β will be in equilibrium, when

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Q109

Open question

The diffusion co-efficient of Ni in Cu at 1000K is 1.93 × 10^-16m².s^-1 & it is 1.94 × 10^-14 m².s^-1 at 1200K. The activation energy (in KJ.mol^-1) for the diffusion of Ni in Cu, is

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Q110

Open question

The relation between K and standard free energy

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Q111

Open question

Configurational entropy due to ideal mixing in a binary A - B system is expressed as:
ΔS_mix = - R(X_A In X_A + X_B In X_B),
where X_A and X_B are mole fractions of A and B respectively.
ΔS_mix is maximum at X_A = . . . . . . . .

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Q112

Open question

For the following reactions, the standard free energy change is given at 1773 K as follows:

\frac{2}{3}

Cr₂O₂(s) =

\frac{4}{3}

Cr(s) + O₂(g)
ΔG° = 447800 J
2H₂(g) + O₂(g) = 2H₂O(g)
ΔG° = - 297000 J
If chromium oxide powder has to be reduced by hydrogen in a fludised bed, the minimum

\frac{P H _{2}}{P H _{0}}

ratio that has to be maintained at the exit of the reactor is

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Q113

Open question

Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10^-2 atm; the partial pressure of B is 10^-3 atm and the partial pressure of AB is 1 atm; the equilibrium constant K is

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Q114

Open question

In which of the following reactions, application of vaccum will help?

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Q115

Open question

In BOF, desiliconisation is a first order reaction. So, the silicon content of the metal decreases

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Q116

Open question

If a multicomponent heterogeneous system at thermodynamic equilibrium, identify the option that need not be true.

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Q117

Open question

Reduction of nickel from a solution of hydrogen takes places as:
Ni²⁺ + H₂ = Ni + 2H⁺
The maximum increase in the reduction rate can be obtained by

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Q118

Open question

The effect of temperature and pressure on chemical equilibrium can be predicted by

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Q119

Open question

For any given partial pressure of CO over liquid steel at a constant temperature, the activities of carbon and oxygen in the metal are related to a constant β as

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Metallurgical Thermodynamics and Kineticspractice.

Metallurgical Thermodynamics and Kinetics
practice.