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MECH 221 ASSIGN ACTUAL EXAM SOLUTION CONCORDIA UNIVERSITY
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- Concordia University ( )
MECH 221 ASSIGN ACTUAL EXAM SOLUTION CONCORDIA UNIVERSITY
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MECH 221 ASSIGN ACTUAL EXAM SOLUTION CONCORDIAUNIVERSITY
Multiple Choice: Select the best answer [30 marks]
1- The crystal structure shown in Figure 1 is:
a) BCC
b) FCC
c) HCP
d) Metallic
e) Ionic
Figure 1
2- A close-packed direction for the unit cell in Figure 1 would be:
a) A – B
b) A – C
c) A – D
d) B – E
e) There are no close-packed directions in this unit cell.
3- A close-packed plane for the unit cell in Figure 1 would be:
a) A B C
b) A B D
c) A B E
d) A C E
e) There are no close-packed planes in this unit cell
4- A very thick piece of iron with negligible initial nitrogen concentration is exposed to nitrogen
gas at a fixed temperature. The surface concentration of nitrogen is maintained at 5 kg/m 3. If
the diffusivity of nitrogen, at this temperature, is 6.9 x 10-11 m2/s, what is the nitrogen
concentration
0.5 mm below the surface after 1 hour of exposure? Refer, if necessary, to the error function
tables at the end of the exam.
a) 5 kg/m3
b) 0.48 kg/m3
c) 1.0 kg/m3
d) 2.4 kg/m3
e) 6.9 kg/m3
5- A metallic cylinder of length 76 mm and diameter 2 mm is subjected to a load of 1413 N.
Under this load, the length of the rod is measured to be 76.50 mm. The yield strength of the
material is 345 MPa and the Young’s modulus is 10.3 x1010 Pa. what will be the length of the
rod after the load is removed?
a) 76.000 mm
b) 76.084 mm
c) 76.168 mm
,
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