@ Roshanpoojary
Air driven rotor : for DGI its 12,000 RPM (In few books its given 10,000 RPM)
for AI its 14,000-15,000 RPM
for TSI its around 9,000 RPM
Electrical Rotor : I dint found specific fig. fr evry instrument,bt only d range b/w 22,500-24,000 RPM