Asking admission committee to confirm if they received my application and letters
Yes, but you should ask whomever it is that you emailed the documents to. You can either ask them to respond in the email with the attachments, or follow up later asking if they received everything. A polite way of doing so might be something like:


  Hi Prof. Dexter, 
  
  I wanted check that you received my transcript and personal statement which I sent on Feb 30. You should have also received three letters of recommendation for me from Profs Dyer, Ellery, and Freeborn. Please let me know if any of these have not arrived and if there are any other documents you needed from me. I'm very excited to be applying to Miskatonic U.
  
  Thank you for your time,
  
  Ululu