Can you limit your survey forms to one answer per IP address?

I want to sent a questionnaire out to my racers ... can i limit the response to once per IP address?  

You can easily do that. While in the form builder, find  the "Preferences" button from the toolbar

 

In the preferences window, click "Form Limits" tab and Select the "Unique Submission" option that you need, in your case this is Strict Check which controls the IP address.

 

Here is a guide in details about this matter

https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form

Nothing opens when I click on Form Limits...... 
...

You had to double click on it until a dropdown menu gets enabled:

 

I've set the "Strict Check" for your form http://www.jotform.com/53006046059954