A company is developing a temperature alarm, based on the schema below, that should close an electric circuit when the temperature rises above 150°C:
| Linear coefficient of thermal expansion (x10-6K-1) | Volumetric mass density (kg/m3) | Melting point (°C) | |
|---|---|---|---|
| Brass | 13 | 8600 | 1000 |
| Copper | 17 | 8940 | 1100 |
| Iron | 11.8 | 7870 | 1500 |
| Mercury | 181 | 13540 | -39 |
| Polystyrene | 70 | 1060 | 100 |
| Steel | 12 | 7800 | 1600 |
Based on available materials and their properties, choose materials for the temperature alarm that require the smallest temperature difference to do the task.
For Material 1:
For Material 2:
Tags
Mechanical EngineeringWould you like to see our other questions?
We have 1000+ premium hand-crafted questions for 160+ job skills and 20+ coding languages. We prefer questions with small samples of actual work over academic problems or brain teasers.
Visit our question libraryPrivate Concierge
Send us an email with an explanation of your testing needs and a list of candidates. We will create an appropriate test, invite your candidates, review their results, and send you a detailed report.
Contact Private ConciergeWould you like to see our tests? The following tests contain Mechanical Engineering related questions:
On the TestDome Blog
Screening Applicants: The Good, the Bad and the Ugly
Since we’re all biased and we use incorrect proxies, why not just outsource hiring to experts or recruitment agencies? After all, they’ve been screening people for many years, so they must know how to do it right?
Not really. I was surprised to discover that many experts disagree with each other. Everybody praises their pet method and criticizes the others. Many of these methods look legitimate, but are based on...