Everything in perceptual research is custom. If the station wants to research its talent, it will usually do clips of that talent and ask for scoring.Is this research polling text-only? Or do they play audio clips of the station's DJs and ask participants to rate them?
Similarly, music blends are done with composite segments of the "hooks" of a variety of songs that show a particular style of blend.
When doing research on a content-heavy morning show, often one would use a long segment with just the ads and songs cut out. The listener would score on a meter (in person or visually online) as the clip progressed.
In moderated one-on-ones or focus groups, if certain elements scored poorly, questions would be asked about why they were not liked.
That was some station trying to do good research techniques with bad methodology.About 10-15 years ago I was part of a station's "listener club" and was periodically sent music surveys (including audio clips of songs), but I was never asked anything about their DJs.