What is enthalpy?
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Metallurgical Engineering · all questionsMetallurgical Thermodynamics and Kinetics
Metallurgical Thermodynamics and Kinetics
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What are the types of entropy?
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Single component system is called
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The specific heat (Cp) of pure iron expressed in J/(mol.K) as a function of temperature T (in K) is given as:
Cp = 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?
Cp = 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?
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The intensive thermodynamic variables among the following are:
P. Pressure
Q. Volume
R. Temperature
S. Enthalpy
P. Pressure
Q. Volume
R. Temperature
S. Enthalpy
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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 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
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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.
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Intensive thermodynamic variables are:
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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 eyx, which is
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The rate of sequential multistep reaction, in a chemically controlled process, is expressed by the Arrhenius equation, During an infinitesimallv small time step, this rate refers to the
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The entropy change, for a spontaneous process is
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The expression of chemical potential for binary real solution having components A and B are
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In a homogenous system (with C as the number of components) in equilibrium, the total number of independent intensive thermodynamic variable is
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For a reaction A ⟶ B, if the rate of change in concentration of A (CA), can be written as then the change concentration with time from initial concentration of A, Cao is given by
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What are the ways through atoms can move inside the materials?
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Maxwell equation is produced from which of the following equation
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The activity coefficient of Q in a liquid Q - R alloy is represented by the following equation at a given temperature.
In γQ = 0.6x2R - 0.2.x3R
What is the activity of Q in an alloy of composition XR = 0.6 at the same temperature?
In γQ = 0.6x2R - 0.2.x3R
What is the activity of Q in an alloy of composition XR = 0.6 at the same temperature?
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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 |
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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 |
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Chemical potential of a component 1 in a binary solution can be defined as
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