please help me out !!!!!!!
what basically a tuned oscillator is?how it can be defined?
how many types of tuned oscillators are there??

 

It is an oscillator that works on a narrow band of frequencies using tuned RF circuits consisting of capacitors and inductors. There are several dozen classic oscillator circuits that differ in the type of components and the layout of those components. The names you should google are:

1. Hartley Oscillator
2. Colpitts Oscillator
3. Pierce Oscillator

That should keep you off the streets for a while.