What is the frequency of rotation of armature coil in AC generators?

Alternating current is produced by AC generator.If the frequency of rotation of electromagnet In a generator Is Increased, the voltage.

How can the speed of rotation of the armature coil of an electric motor be increased ?

If the speed of rotation of the armature of a generator is doubled, how does it affect [i] the maximum emf produced and [ii] the frequency of the emf ?

State the principle of an AC generator. What determines the frequency of AC produced in a generator?

What is an armature?