Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering Page-1 section-2

Section 1 Section 2

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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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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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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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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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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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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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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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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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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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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1 2

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

Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering

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

Answer & Solution

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

Answer & Solution

3. The expression for work done at constant volume is

Answer & Solution

Answer & Solution

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

Answer & Solution

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?

Answer & Solution

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 μji represents the chemical potential of component i in phase j, then the condition for equilibrium is

Answer & Solution

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

Answer & Solution

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

Answer & Solution

10. The relation between K and standard free energy

Answer & Solution

Read More Section(Metallurgical Thermodynamics and Kinetics)

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

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

3.
The expression for work done at constant volume is

5.
Which one of the following statements about the order of a reaction is false?

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?

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

8.
At constant temperature and pressure, two phase α and β will be in equilibrium, when

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

10.
The relation between K and standard free energy