Translation:Do you know who the new principal is?
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This is how subordinate clauses are formed in Chinese:
新校长是谁？- Who is the new principal? (a simple question; note how this whole chunk will remain unchanged in the following sentences)
你知道新校长是谁。- You do know who the new principal is. (a declarative sentence - we need 吗 to turn it into a question)
你知道新校长是谁吗？- Do you know who the new principal is?
In a subordinate clause, 谁 loses its function as a question word and becomes a conjunction.