Please refrain from posting if you have no idea of what you are talking about.
http://forum.mikrotik.com/t/some-quick-comments-on-configuring-cake/152505/1
Here’s a topic of one of the contributors to cake talking in depth about how it works, in many examples the bandwidth limit is set directly on the queue type.
There they talk about how it works and the benefits of configuring it directly on the queue type.