
Pre Exam
Authored by Justin Sawadski
Engineering
University
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35 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following correctly ranks the three types of ferrous alloys by their carbon content, from lowest (<0.008. wt% C) to highest (2.14 - 6.70 wt% C?
iron, cast iron, steel
steel, cast iron, iron
cast iron, iron, steel
iron, steel, cast iron
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Select the choice that best completes the following sentence: When cooled slowly, transformations near the melting temperature tend to yield ___ grains due to the formation of___ nucleation sites followed by ____ grain growth.
fine...few...slow
coarse…few…slow
coarse…few…rapid
fine...multiple..rapid
fine…multiple...slow
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the Pb-Sn phase diagram, there are a number of invariant transformations and solid state phases. How many degrees of freedom are there in the solid alpha single phase region and at the invariant points. respectively?
2.0
0.2
1.0
1.2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For a solid-state transformation that obeys the Avrami equation, the parameter n has been determined to have a value of 1.5. The reaction takes 125 seconds to reach 30% completion. (What is the total time in seconds) for the transformation to reach 95% completion?
258
516
0.35
125
25
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Based on the standard EMF series and your knowledge of half-reactions, determine the cell potential and spontaneity of a cell that consists of a pure cobalt electrode in a solution of Co2+ ions; the other half is a lead electrode immersed in a Pb2+ solution.
Pb2+ + 2e- —-> Pb -0.126
Sn2+ + 2e- —-> Sn -0.136
Ni2+ + 2e- —-> Ni -0.25
Co2+ + 2e- —-> Co -0.277
+0.151, spontaneous
-0.403, nonspontaneous
-0.151, nonspontaneous
+0.403, spontaneous
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What best describes the thermodynamic condition that must be met for a state of equilibrium to exist?
Maximized Gibbs Free Energy at constant temperature and pressure
Metastability
Minimized Entropy for a completely isolated system
Minimized Free Energy
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For the solidification of pure gold, calculate the critical radius (r*) and the activation of free energy (AG"). Assume homogeneous nucleation conditions. The values of the latent heat of fusion and the surface free energy are -1.16x10^9° J/m° and 0.132 J/m?, respectively. The degree of supercooling is 230 K and the meting point of gold is 1064 °C.
1.3 nm and 9.6x10-19 1/m^2
0.9 nm and 4.2x10-19 J/m^2
126 nm and 1.5×10-18 J/m2
0.6 nm and 2.3×10-19 J/m~2
10.1 nm and 5.7x10^-175/m^2
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