The purpose was to gauge overall understanding of an electrical engineering undergraduate degree.
It started simple and then worked up to advanced concepts until the interviewee began to struggle.
At this point, the interviewer dug in and began to ask conceptual questions that required extending general undergraduate knowledge.
For example: What is capacitor self-resonance? This is not taught in undergrad generally, but it is obvious if you understand the basics.
Being flown out to Seattle is cool for an intern interview.
Capacitor self-resonance.
Op-amp circuits (textbook).
Trace parasitics and transmission lines.
FPGA design:
The following metrics were computed from 1 interview experience for the Microsoft Hardware Intern role in Seattle, Washington.
Microsoft's interview process for their Hardware Intern roles in Seattle, Washington is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Microsoft's Hardware Intern interview process in Seattle, Washington.