Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers

1

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

A) 4.19 B) 3.12 C) 2.42 D) 1.34

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Answer & Solution

Answer: Option C

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2

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

A) P-4, Q-3, R-2, S-1 B) P-2, Q-3, R-4, S-1 C) P-3, Q-4, R-2, S-1 D) P-1, Q-2, R-3, S-4

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Answer & Solution

Answer: Option A

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3

The expression for work done at constant volume is

A) W = PdV = P(V₂ - V₁) B) W = 0 C) $$W = \frac{{{P_1}{V_1} - {P_2}{V_2}}}{{\gamma - 1}} = \frac{{nR\left( {{T_1} - {T_2}} \right)}}{{\gamma - 1}}$$ D) $$W = nR{T_1}\ln \left( {\frac{{{V_2}}}{{{V_1}}}} \right)$$

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Answer & Solution

Answer: Option B

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4

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?

A) 0.011 B) 0.022 C) 0.088 D) 0.176

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Answer & Solution

Answer: Option B

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5

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

A) Order of a reaction can be a positive integer B) Order of a reaction can be a fraction C) Order of a reaction can be zero D) Order of a reaction can not change as the reaction proceeds

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Answer & Solution

Answer: Option B

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6

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?

A) Increasing both temperature & pressure B) Decreasing temperature & increasing pressure C) Decreasing both temperature & pressure D) Increasing temperature & decreasing pressure

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Answer & Solution

Answer: Option D

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7

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

A) μ^α_x = μ^β_y and μ^β_x = μ^α_y B) μ^x_β = μ^y_α and μ^x_α = μ^y_β C) μ^α_x = μ^β_y and μ^α_x = μ^β_y D) μ^α_x = μ^α_y and μ^β_x = μ^β_y

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Answer & Solution

Answer: Option C

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8

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

A) chemical potential of each component is same in α and β B) partial molar free energy of each component is not the same in α and β C) Gibbs free energy of mixing is minimum D) enthalpy of mixing is zero

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Answer & Solution

Answer: Option A

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9

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

A) 130 B) 180 C) 230 D) 250

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Answer & Solution

Answer: Option C

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10

The relation between K and standard free energy

A) $$\Delta {H^0} = - RT\ln K$$ B) $$\Delta {S^0} = - RT\ln K$$ C) $$\Delta {G^0} = - RT\ln K$$ D) $$\Delta {G^0} = R\ln K$$

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Answer & Solution

Answer: Option C

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Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering