Is it any use installing Dnscrypt-proxy when we have Tor? Does the FAI know my internet queries when I use Tor?

A plain answer please.

Thank you very much.

Encrypt DNS Traffic With DNSCrypt: http://www.shellhacks.com/en/Encrypt-DNS-Traffic-With-DNSCrypt

Is it useful to install DNSCrypt-proxy when we already have Tor? Does the ISP knows my internet queries when I use Tor?