Can JotForm handle 300 questions in one form/survey and export the submissions to excel as well?

1) can your system handle 300 questions in one survey (writing to Excel the answers)

Hi,

Yes, Jotform should be able to handle that number. 

As for the exporting submissions, please follow this guide: http://www.jotform.com/help/44-How-to-Export-Form-Data-to-Excel

Or, this guide: http://www.jotform.com/help/101-How-to-create-an-Excel-Report.

Thanks