WCAS - Washington Comprehensive Assessment of Science Engineering Design and Solutions Questions and Answers

Question 1

An engineering team is designing a new commuter bicycle.
The marketing department has specified that the bicycle must be priced under $400 and weigh less than 15 kg.
The design will be considered successful if it achieves a durability rating of at least 8 out of 10 in stress tests.
Which of the following is a design *constraint*?

Accepted Answer

Weighing less than 15 kg

Answer

Achieving a durability rating of 8/10

Answer

The color of the bicycle frame

Answer

The number of gears it has

Question 2

A student group has identified a problem: the classroom's recycling bin is often contaminated with non-recyclable trash. They have brainstormed several potential solutions. According to the engineering design process, what is the most logical next step?

Accepted Answer

Establish criteria and constraints to evaluate the potential solutions.

Answer

Build a prototype of the most complex solution to see if it works.

Answer

Select the cheapest solution and implement it immediately.

Answer

Create a final presentation of the chosen solution for the teacher.

Question 3

Which of the following best defines a 'trade-off' in the context of engineering design?

Accepted Answer

A design choice where improving one desired feature necessitates worsening another.

Answer

The process of building a physical model to test a potential solution.

Answer

The final, optimized solution that is chosen for mass production.

Answer

A situation where a design completely fails to meet any of the established criteria.

Question 4

A team is developing a device to purify water in remote areas. They have built an initial prototype. What is the primary purpose of building and testing this first prototype?

Accepted Answer

To identify flaws and gather performance data to inform the next design iteration.

Answer

To secure funding from investors for mass production.

Answer

To create the final, polished product ready for sale to consumers.

Answer

To prove that their initial design concept is perfect and requires no changes.

Question 5

An engineer is designing a new ski helmet. The primary criterion is safety, but other important criteria include low weight, comfort, and aerodynamics. The engineer finds that using a denser, thicker foam improves the safety rating significantly but also increases the helmet's weight and reduces its aerodynamic efficiency. This situation is a clear example of:

Accepted Answer

The need to make trade-offs between competing criteria.

Answer

A systematic failure in the design process.

Answer

The complete satisfaction of all design constraints.

Answer

An error in the initial problem definition.

Question 6

An engineering team has developed and tested three different prototypes for a new, inexpensive solar-powered lamp. The primary goal is to maximize brightness (measured in lumens) while keeping the cost under a $15 constraint. Which prototype should be selected for further development?

Accepted Answer

Prototype D: 180 lumens, $14 cost.

Answer

Prototype A: 150 lumens, $12 cost.

Answer

Prototype B: 200 lumens, $18 cost.

Answer

Prototype C: 140 lumens, $14 cost.