Cisco MQC auto QoS

Not had to work much with QoS So trying to understand the MQC auto qos implementation on IOS XE and how I would go about I see the replacing/simplifying the complexitiy of the configuration applied when auto qos trust is applied to an interface:

The following configuration is generated could someone explain the questions below:

 policy-map AutoQos-4.0-Output-Policy class AutoQos-4.0-Output-Priority-Queue priority level 1 percent 30 class AutoQos-4.0-Output-Control-Mgmt-Queue bandwidth remaining percent 10 queue-limit dscp cs2 percent 80 queue-limit dscp cs3 percent 90 queue-limit dscp cs6 percent 100 queue-limit dscp cs7 percent 100 queue-buffers ratio 10 

Can someone explain the function of queue-limit in the class AutoQos-4.0-Output-Control-Mgmt-Queue?

 class AutoQos-4.0-Output-Multimedia-Conf-Queue bandwidth remaining percent 10 queue-buffers ratio 10 class AutoQos-4.0-Output-Trans-Data-Queue bandwidth remaining percent 10 queue-buffers ratio 10 class AutoQos-4.0-Output-Bulk-Data-Queue bandwidth remaining percent 4 queue-buffers ratio 10 class AutoQos-4.0-Output-Scavenger-Queue bandwidth remaining percent 1 queue-buffers ratio 10 

Is the bandwidth allocated supposed to match the queue-buffers? If so why are the queue buffers over specced for Scavenger class?

 class AutoQos-4.0-Output-Multimedia-Strm-Queue bandwidth remaining percent 10 queue-buffers ratio 10 class class-default bandwidth remaining percent 25 queue-buffers ratio 25 

Is the bandwidth in the priority queue reserved (ie cannot be used by any other class) or is the available for SRR like the others allocated via bandwidth remaining?