Can I send my Dubai rental income back to India, and how is it taxed?

Yes. Dubai levies no tax on rent, so you keep the gross. To send it home, route it through your NRE account (fully repatriable, no Indian tax on the transfer itself) rather than an NRO account (30% TDS, up to USD 1 million a year). Residents must still declare the rent in their ITR under Schedule FSI.