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- Question 1 of 15
The change of standard state from pure liquid to 1 wt.% for Si dissolved in liquid Fe at 1873 K is expressed as Si (liq.) = Si (1 wt.%) Given that the activity coefficient of Si at infinite dilution in Fe is .001, the standard Gibbs free energy change (in kJ) for this equilibrium isCorrectIncorrect
- Question 2 of 15
Direct Reduced Iron (DRI) produced from a gas based process contains Fe, FeO, C and remainder being gangue. The chemical composition of DRI is: Total Fe = 92 wt.% and Metallic Fe = 84 wt.%. The weight percent of FeO in DRI isCorrectIncorrect
- Question 3 of 15
In BOF steelmaking, 5 metric ton of lime containing 90 wt.% CaO is used to refine 100 metric ton of hot metal containing 93.2 wt.% Fe. The slag produced during refining contains 40 wt.% CaO and 22 wt.% FeO. Neglecting material losses, the yield of Fe (in %) isCorrectIncorrect
- Question 4 of 15
In vacuum degassing of steel, 14 ppm of dissolved nitrogen is in equilibrium with 1 mbar of nitrogen gas at 1873 K. At the same temperature, if the pressure is lowered to 0.7 mbar, the equilibrium nitrogen content (in ppm) isCorrectIncorrect
- Question 5 of 15
A tensile stress is applied along the  direction in a FCC metal crystal. The critical resolved shear stress is 6 MPa. The tensile stress (in MPa) required for initiating slip on the (111) slip plane isCorrectIncorrect
- Question 6 of 15
For a bcc metal the ratio of the surface energy per unit area of the (100) plane to that of the (110) plane isCorrectIncorrect
- Question 7 of 15
For a polymer reinforced with 40 vol.% glass fiber, the elastic modulus (in GPa) along the transverse direction isCorrectIncorrect
- Question 8 of 15
For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 750 mm, the approximate solidification time (in minutes) estimated using Chvorinov’s rule is [The mould constant is 2 s/mm2] (read mm2 as mm square)CorrectIncorrect
- Question 9 of 15
Match the deformation processes in Column I with the corresponding stress states listed in Column II
Column I Column II
[P] Wire Drawing  Direct Compression
[Q] Forging  Indirect Compression
[R] Stretch Forming  Tension
[S] Cutting  ShearCorrectIncorrect
- Question 10 of 15
Which of the following properties is intensiveCorrectIncorrect
- Question 11 of 15
Zn is commercially extracted from which of the following minerals?CorrectIncorrect
- Question 12 of 15
Based on the standard galvanic series select the correct sequence of metals in increasing order of anodic behaviorCorrectIncorrect
- Question 13 of 15
In an x ray powder pattern of a simple cubic crystal the 2nd peak corresponds toCorrectIncorrect
- Question 14 of 15
When boron (trivalent) is doped to silicon the resulting material isCorrectIncorrect
- Question 15 of 15
Which of the following is typical rolling effect?CorrectIncorrect