Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers

11

The entropy change, for a spontaneous process is

A) > 0 for the system B) < 0 for the system C) > 0 for the system and the surrounding D) < 0 for the system and the surrounding

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Answer & Solution

Answer: Option D

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12

The expression of chemical potential for binary real solution having components A and B are

A) $${\mu _A} = {G_A} + \Omega {\left( {1 - {X_A}} \right)^2} + RT\ln {X_A}$$ B) $${\mu _B} = {G_B} + \Omega {\left( {1 - {X_B}} \right)^2} + RT\ln {X_B}$$ C) Both A and B D) None of these

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Answer: Option C

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13

In a homogenous system (with C as the number of components) in equilibrium, the total number of independent intensive thermodynamic variable is

A) C - 1 B) C C) C + 1 D) C + 2

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Answer: Option C

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14

For a reaction A ⟶ B, if the rate of change in concentration of A (C_A), can be written as $$\frac{{ - dCA}}{{dt}} = k.C_A^2,$$ then the change concentration with time from initial concentration of A, Cao is given by

A) $$\left( {\frac{1}{{{C_A}}}} \right) - \left( {\frac{1}{{{C_{AO}}}}} \right) = K.t$$ B) (C_AO - C_A) = k.t C) $$\left( {{C_{A{O^2}}} - C_A^2} \right) = k.t$$ D) $${\text{In}}\left( {\frac{{{C_{AO}}}}{{{C_A}}}} \right) = k.t$$

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Answer & Solution

Answer: Option A

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15

What are the ways through atoms can move inside the materials?

A) Translational motion B) Rotational motion C) Vibrational motion D) All are correct

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Answer: Option D

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16

Maxwell equation $${\left( {\frac{{\partial P}}{{\partial T}}} \right)_V} = {\left( {\frac{{\partial S}}{{\partial V}}} \right)_T}$$ is produced from which of the following equation

A) dU = Tds - PdV B) dH = Tds + VdP C) dA = - PdV - SdT D) dG = VdP - SdT

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Answer: Option C

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17

The activity coefficient of Q in a liquid Q - R alloy is represented by the following equation at a given temperature.
In γ_Q = 0.6x²_R - 0.2.x³_R
What is the activity of Q in an alloy of composition XR = 0.6 at the same temperature?

A) 0.16 B) 0.24 C) 0.32 D) 0.48

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Answer: Option D

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18

Match the following:

Group 1	Group 2
P. Debye temperature	1. Rate constant
Q. State property	2. Specific heat
R. Thermodynamic probability	3. Internal energy
S. Activation energy	4. Microstate in a macrostate

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

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Answer: Option B

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19

Match the following:

Group 1	Group 2
P. Volume	1. State function
Q. Temperature	2. Intensive property
R. Work done	3. Extensive property
S. Molar entropy	4. Path dependent

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

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Answer: Option D

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20

Chemical potential of a component 1 in a binary solution can be defined as

A) $$\left( {\frac{{\partial A}}{{\partial {n_1}}}} \right)T,V,{n_2}$$ B) $$\left( {\frac{{\partial U}}{{\partial {n_1}}}} \right)S,V,{n_2}$$ C) $$\left( {\frac{{\partial H}}{{\partial {n_1}}}} \right)S,V,{n_2}$$ D) $$\left( {\frac{{\partial G}}{{\partial {n_1}}}} \right)S,p,{n_2}$$

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Answer: Option D

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Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering