1
Exam 3 Report 12/13/2017
1. Summary
Total number of students 18
Attended 18
Missed 0
Number of problems 6
Average grade 81.85
Standard deviation of grades 12.17
2. Grade distribution
3. Comparison with past years
0 0 0
1
2
4
7
4
0 1 2 3 4 5 6 7 8
0-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100
Number of Students
Grade
Total Grade Distribution
81.85 82.82 81.49 83.98 81.24 80.06 85.81 80.29
12.17 9.58 11.83 12.69 13.49 11.62 10.93 14.06
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
2017 2016 2015 2014 2013 2012 2010 2009
Grade
Year
Comparison with Previous Years
Average Standard Deviation Average Over 2009-2017
2 4. Individual problem breakdown
5. Grade distribution per problem
8.53 8.22 8.64
7.19
8.36 8.17
1.49 1.63
1.15
1.96 1.93
1.54 0.00
1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
1 2 3 4 5 6
Grade
Problem
Individual scores per problem
Average
Standard Deviation
0 0 0
1
4
2
1
10
0 0
2
1 1
2
5
7
0 0 0 0
3
5
2
8
0 0
4
3
2
3
1
5
0
1 1
0
2 2
3
9
0 0
1
0
4 4 4
5
0 2 4 6 8 10 12
0-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10
Number of Students
Grade
Grade distribution per problem
P1 P2 P3 P4 P5 P6
3 6. Comments
OVERALL
• All students followed the rules for the formula sheet.
PROBLEM 1
• Some students made mistakes when calculating derivate of the stream function
• Some students made mistakes when evaluating velocity at the stagnation point PROBLEM 2
• Many students used incorrectly used the same velocity for ball and rod power calculation
• Many students could not calculated the drag with the correct characteristic area PROBLEM 3
• Many students incorrectly used radial length of the rotor instead of chord length for the calculation of the boundary layer thickness
PROBLEM 4
• Many students try to use the drag coefficient to calculate the drag instead of using the control volume method
• Some students used incorrect bound for the integral (i.e. ∫02𝑏𝑏 instead of ∫−𝑏𝑏𝑏𝑏 )
PROBLEM 5
• Some students did not setup the system of equation required to solve the parallel pipe system correctly
PROBLEM 6
• Many students could not apply the given function into the simplified governing equation to solve for k constant
