Question: In case of WPA2 using the Radius server, every client gets its own username and password. But what is the case in the WPA2 using a PSK without the authenticating server. In this case also we have a 4 way handshake. But is the PTK derived by all clients different or the same?

Answer: 
The communication between Tor's **[exit nodes](https://hackertarget.com/tor-exit-node-visualization/)** and the Internet is not different from normal traffic which thing makes Tor also prone to MITM attacks. Entry nodes do not cause a problem, but exit nodes do.

To answer straight forward to your question. it depends on what you mean exactly by *see my requests*. In practice, by design TOR is such that locating the source of such request sthrough the network should be difficult to determine, including your typical case. 

However relying on unencrypted protocols (such as sending emails using SMTP) leads to your TOR requests being able to be entirely monitored (or *seen*, in your own vocabulary).
The traffic between your computer and the TOR entry node is encrypted, so it is not possible for someone to see the unencrypted content of your TOR traffic between your PC and the entry node.

The traffic between the TOR exit node and the site you are accessing is not always encrypted (depends on the site), so it would be possible for somebody to sniff and see that traffic in unencrypted form.