What are the three different ways of cooling a transformer?

Why do we transmit high voltages in overhead cables?

There are 2 types of transformer cores, one is a core type, what is the name of the other type?

What voltage do power stations generate?

Which of these voltages are available locally?

What fuel is used in a thermal power station?

Which of these are found in a sub-station, tick all that apply?

What is used in transmitting electrical energy from a power station?

 $The\ transformer\ equation\ is\ \frac{Vp}{Vs}=\frac{Np}{Ns}$  

If a transformer is rated 1200/400V what is this referring to?

If a transformer is rated 1200/400V what is the ratio of turns Np:Ns