Are Reversible Processes Adiabatic?

Reversible adiabatic process is also called an Isentropic Process. It is an idealized thermodynamic process that is adiabatic and in which the work transfers of the system are frictionless; there is no transfer of heat or of matter and the process is reversible.

Is a reversible process an adiabatic process?

Such a process is called an isentropic process and is said to be "reversible". ... Such a process is neither adiabatic nor isentropic, having Q > 0, and ΔS > 0 according to the second law of thermodynamics.

Is reversible non adiabatic process possible?

There are no conditions on it concerning the existence of heat exchange, so there is no problem in having an adiabatic or a non adiabatic reversible process (theoretically). However, in practice, reversible processes themselves are impossible.