@crutshow thanks.
Crudely though,neglecting "You must have enough primary turns to create sufficient inductance at the operating frequency so that the magnetizing current with no load is sufficiently low (typically a few percent of the full load current). ",I have come up with this:
Consider a P=240 S=60 turn transformer.What I think is that if I wind such a transformer ,And if I check up Voltage at secondary,it should be indeed be 60V ,IF NO LOAD WILL BE CONNECTED.But if I connect a load(in normal case),due to the current set up ,opposing flux will be set up in the core and to maintain flux,current will be drawn from the primary.But what will happen in this case is,though all flux of primary is linked with secondary,not all flux of secondary will be linked with primary(if the no. of turns are sufficiently small) and hence,the transformer will not be able to deliver any current.
What is your say?