ENGR-A110FallHomework7
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W.D. Cottrell, Ph.D.
ENGR-A110
Due October 11th, 2023
Homework Assignment #7
Name___________________________________________
Engineering Design Considerations, with Sustainability & Optimization
Various multiple-choice questions and exercises on the topics listed above.
Please download the
assignment, and write your responses directly on the pages.
Submit the hard copy.
Consult the Lesson
8 & 9 slides.
1.
In the Igor Sikorsky Human-Powered Helicopter (HPH) Competition, what school was the
first to get airborne
?
Consult any reliable reference on the competition, which lasted from 1980 to 2013.
a.
Cal Poly San Luis Obispo
b.
Nihon University
c.
University of Maryland
d.
University of Toronto
2.
How much money was offered initially, in the Igor Sikorsky HPH Competition, for a winning design?
a.
$
2,500
b.
$
25,000
c.
$250,000
d.
$2.5 million
3.
During the period of the Igor Sikorsky HPH Competition, what was the
maximum number of years
that passed with
no
entries able to get airborne?.
a.
None
b.
9
c.
15
d.
33
4.
In the photo in Figure 3.1 in the textbook, what are the two engineers designing?
a.
Oscillating fan
b.
Projectile launcher
c.
Rotary engine
d.
Wind turbine
5.
In Table 2.2 in the textbook, excluding sleep, on which activity does the freshman engineering student spend most
of his or her weekly time?
Be sure to indicate the
number of hours
next to your selection.
a.
Calculus (class & study)
b.
Chemistry (class & study)
c.
Exercise & recreation
d.
Relaxing
1
W.D. Cottrell, Ph.D.
ENGR-A110
Due October 11th, 2023
6.
In the 2015 film
Spare Parts
, what type of engineering design competition did the students enter?
Consult any
reliable reference.
a.
Concrete canoe
b.
Drones
c.
Human-powered aircraft
d.
Robotics
7.
Also, in
Spare Parts
, the students were from what type of institution?
a.
High school
b.
Community college
c.
University (undergraduate)
d.
University (graduate)
8.
An engineering design team developed an alternatives evaluation, with four design criteria: appearance (1), cost of
production (2), ease of use (3), and safety (4).
The team chose safety over appearance, cost of production and ease
of use.
One team member chose appearance over ease of use.
Two team members chose appearance over cost of
production, and three team members chose ease of use over cost of production.
How should the design criteria of
appearance, cost of production, ease of use, and safety be rated in an evaluation – that is, in what order, from
highest to lowest score?
a.
1, 2, 3, & 4
b.
3, 1, 2, & 4
c.
4, 1, 3, & 2
d.
4, 3, 2, & 1
9.
The CEO of a small engineering firm – the company is so small that it is not required by the federal government to
depreciate its assets – is considering the purchase of a company car that the CEO will also use on the weekends.
Four cars are being considered, and the selection criteria are comfort, cost, fun, kayak (i.e., whether or not the car
can transport a kayak), look, and storage (i.e., interior storage space).
The CEO has rated each car according to
how well it meets each criterion, as shown in the following table.
The CEO is uncertain about the
importance
of
each criterion, though.
If each criterion is worth the same
, then which car should be selected?
Be sure to indicate
the
score
next to your selection.
The procedure is similar to that shown in the textbook, and in Lesson 9.
Car
Comfort
Cost
Fun
Kayak
Look
Storage
Family car
4
3
0
2
0
1
Sports car
2
1
5
0
5
0
Station wagon
5
4
1
5
1
5
SUV (4 x 4)
4
2
4
5
4
4
a.
Family car
b.
Sports car
c.
Station wagon
d.
SUV (4 x 4)
10.
Regarding the preceding problem, after some consideration, the CEO decides to assign ratings to the selection
criteria as follows: comfort-4, cost-5, fun-2, kayak-5, look-3, & storage-5.
Using the weighted criteria, which car
should the CEO select?
Be sure to indicate the
score
next to your selection.
a.
Family car
b.
Sports car
c.
Station wagon
d.
SUV (4 x 4)
2
W.D. Cottrell, Ph.D.
ENGR-A110
Due October 11th, 2023
11.
A mechanical engineering team is working on a Walk-Behind Power Lawnmower design.
Seven design criteria are
being considered, with the following priorities:
Criteria
Priority
Safe to operate
Essential
Economical
High
Portable
High
Easy to start & operate
High
Easily serviced
Medium
Cuts grass at 1.5" to 4.0"
Medium
Aesthetically pleasing
Medium
The team decides that Essential is worth 4 points, High is worth 2, and Medium is worth 1.
Three alternatives are
being considered, with criteria ratings as follows.
(3 = meets or exceeds criterion; 2 = meets criterion less well; 1 =
does not meet criterion).
Criteria
Gas-Powered, Manual Start
Gas-Powered, Electric Start
Electric
Powered
Safe
3
3
3
Economical
$100
$170
$80
Portable
2
1
3
Easy to start & run
1
2
2
Easily serviced
2
1
3
Cuts grass to 1.5-4"
3
3
3
Aesthetics
2
3
1
Based on the preceding information, which lawnmower should be produced?
Be sure to assign reasonable scores
to the costs in the "Economical" line.
Also, indicate the
total score
next to your selection.
a.
Gas-powered, manual start
b.
Gas-powered, electric start
c.
Electric powered
d.
None of the above
12.
In the preceding problem, the design team observed that the electric-powered lawnmower needs to be recharged,
while the other two do not.
What should the design team do about their observation?
a.
Add "Needs recharging" to the design criteria, assign it a rating, and reevaluate the alternatives.
b.
Adjust one or more of the existing design criteria scores for the electric-powered lawnmower.
c.
Drop the electric-powered lawnmower from consideration.
d.
Ignore the recharging need, and continue with the original selection.
13.
According to the Wikipedia article "Robot Competition," which of the following is closest to the number of
robotics competitions for students (only), worldwide, as of this writing?
a.
15
b.
25
c.
35
d.
45
3
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W.D. Cottrell, Ph.D.
ENGR-A110
Due October 11th, 2023
14.
The City of Costa Mesa has a LEED Gold Certification (for cities & communities) because of which of the
following sustainability-related measures?
Consult any reliable reference, such as the City’s official website.
a.
Greenhouse gas emissions per capita
b.
No-growth plan to limit development
c.
Percent of solid waste that is recycled
d.
Solid waste generation per capita
15.
Which of the following is
closest
to the number of LEED-certified buildings worldwide
?
a.
1,000
b.
10,000
c.
100,000
d.
1 million
16.
Which of the following categories carries
the most weight
in the LEED Green Building certification process?
a.
Energy efficiency & atmosphere
b.
Indoor environmental quality
c.
Sustainable sites
d.
Water efficiency
17.
Which of the following buildings in Costa Mesa is LEED
Platinum
-certified?
a.
Canon Experience Center, 123 Paularino Avenue
b.
Class A Park Tower Office Building, 695 Town Center Drive
c.
Fixtures Living, 3303 Hyland Avenue #D
d.
Tiffany & Co., South Coast Plaza
18.
Identify each of the following famous logos by indicating the associated company or organization.
4
W.D. Cottrell, Ph.D.
ENGR-A110
Due October 11th, 2023
19.
A manufacturing firm produces two components for electric scooters.
An axle requires 2.4 min of molding time
and 5.0 min of assembly time.
The profit for axles is $0.60 per unit.
A single handlebar grip requires 3.0 min of
molding time and 2.5 min of finishing time.
The profit for grips is $0.70 per unit.
The molding department has
1,200 minutes of time per week to allocate to these products.
The finishing department has idle capacity of 600
minutes per week, and the assembly department can supply 1,500 minutes of capacity per week.
The firm wants to
determine the optimum production amounts of axles and grips this week using a linear programming method.
In the formulation, how many
constraints
(i.e., constraint equations) are there?
a.
3
b.
4
c.
5
d.
6
20.
How many
objective functions
are there?
a.
1
b.
2
c.
3
d.
4
21.
Which constraint involves
two
variables?
a.
Assembly time
b.
Finishing time
c.
Molding time
d.
All constraints
5
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