Question

air friction on satellites increases its velocity....give reason

Answer 1

Yes, satellites do indeed speed up as atmospheric drag acts on them. ... There's a few ballistic air molecules flying around and hitting the spacecraft creating drag. This decreases the total energy of the orbit. This causes the satellite to fall to a slightly lower altitude.
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Answer 2

air friction on satellites increases its velocity....give reason?

Air friction does increase the velocity of the satellite.

It just happens that the slowing is enough to give the satellite a circular orbit, at the new, lower height, and thus at a higher velocity, than it had at the start of this process.