Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers

1

What is enthalpy?

A) Heat of any system B) entropy of any system C) phase of any system D) none of these

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Answer & Solution

Answer: Option A

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2

What are the types of entropy?

A) Thermal entropy B) Configurational entropy C) Both A and B D) None of these

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Answer & Solution

Answer: Option C

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3

Single component system is called

A) ternary system B) binary system C) unary system D) none of these

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Answer & Solution

Answer: Option C

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4

The specific heat (C_p) of pure iron expressed in J/(mol.K) as a function of temperature T (in K) is given as:
C_p = 17.49 + 24.77 × 10^-3 T
What is the change in the enthalpy of pure iron (in J/mol) when it is heated from 25°C to 700°C?

A) 11200 B) 22400 C) 28600 D) -32500

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Answer & Solution

Answer: Option B

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5

The intensive thermodynamic variables among the following are:
P. Pressure
Q. Volume
R. Temperature
S. Enthalpy

A) P, Q B) P, R C) R, S D) Q, R

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Answer & Solution

Answer: Option B

Solution:

P. Pressure is an intensive variable because it remains the same regardless of the system's size or quantity.
Q. Volume is an extensive variable because it depends on the size or amount of the system.
R. Temperature is an intensive variable because it remains constant regardless of the system's size or quantity.
S. Enthalpy is an extensive variable because it depends on the size or amount of the system.

Based on the given options, the correct answer is:
B. P, R

6

Liquid steel contains initially 0.05 mass% P and this has to be reduced to 0.01 mass% using a basic slag. The equilibrium distribution ratio of P between slag and metal is $$Lp = \frac{{\left( {\% P} \right){\text{slag}}}}{{\left( {\% P} \right){\text{metal}}}}, = 80;$$ Assuming that in itially the slag does not contain any phosphorous (P), then the minimum weight of slag (ton) required per ton of steel is

A) 0.025 B) 0.05 C) 0.075 D) 0.10

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Answer & Solution

Answer: Option B

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7

The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm. mole, its fugacity at 300 K would be . . . . . . . . Pascal.

A) 3171 B) 3567 C) 1.01 × 10⁵ D) 5000

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Answer & Solution

Answer: Option B

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8

Intensive thermodynamic variables are:

A) independent of the number of moles in the system B) dependent on the volume of the system C) dependent on the mass of the system D) independent of the temperature of the system

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Answer & Solution

Answer: Option A

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9

In a dilute solution of elements X, Y etc. in liquid iron, the effect of Y on the activity co-efficient (fx) and the activity (hx) of X with respect to the Henrian 1wt% standard state is taken into account by the activity interaction co-efficient e^y_x, which is

A) $$e_x^y = \frac{{\partial \log hx}}{{\partial \left[ {\% Y} \right]}}$$ B) $$e_x^y = \frac{{\partial \log fx}}{{\partial \left[ {\% Y} \right]}}$$ C) $$e_x^y = \frac{{\partial hx}}{{\partial \left[ {\% Y} \right]}}$$ D) $$e_x^y = \frac{{\partial fx}}{{\partial \left[ {\% Y} \right]}}$$

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Answer & Solution

Answer: Option B

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10

The rate of sequential multistep reaction, in a chemically controlled process, is expressed by the Arrhenius equation, $$k = A{e^{\left( { - \frac{Q}{{RT}}} \right)}}.$$ During an infinitesimallv small time step, this rate refers to the

A) rate of the fastest step in the reaction B) rate of the slowest step in the reaction C) average rate of the fastest and the slowest step D) average rate of all the steps in the reaction

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Answer & Solution

Answer: Option B

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Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering