Why did Jesus ask questions after parables?

Evaluation is very important after explaining, comparing and applying the new thoughts.
Jesus did it in a way understandable to common people. He evaluated the listeners' knowledge so that they can create new works based on this understanding.
Some academic researches reflect this, as below:

This was the way (questions) all Jewish rabbis taught there students. They even do it today.

He's just checking if you are listening.

I think its to test understanding of what we was trying to say.