What are the consequences of this new modification of the round-robin scheuling?

Question

In a round-robin scheduler, usually a ready queue contains all processes waiting for CPU burst time. Each process exists exactly once in the queue. Suppose that the scheduler allowed a process to exist more than once in the queue.

1. What are the consequences of this new modification of the round-robin scheuling?
2. When this new scheduling modification can be useful?

Answer 1

Then the process shall receive more processing time than the others, which may be useful

if it is a priority queue