Query in mycelium wallet?

[coinfunda]

Why there are 3 different pvt keys.
Is it he or cold wallet, want is the meaning of that?

[HCP]

Mycelium wallet is known as a "Hierarchical Deterministic" or "HD" wallet. It doesn't contain just a single private key... it generates multiple private keys, so that you can get a different address every time you deposit. It does this to try and help avoid "address re-use".

It is perfectly normal behaviour.

Note that you can still reuse an address that it creates, multiple times if you wish... it just isn't recommended for privacy reasons.

[bob123]

Mycelium would only be used as a cold wallet if it is completely offline (not a single interface available on your mobile, no wifi, bluetooth, nfc, ... ).
If it is on your mobile which is connected to the internet, has a SIM inserted, etc.. it is a hot wallet.

Cold wallet = completely offline (all the time)
Hot wallet = network interfaces enabled (e.g. connected to the internet)