Question

What is the formula for the number of field turns of the field windings?

(a) number of field turns = field mmf per pole at full load * field current

(b) number of field turns = field mmf per pole at full load / field current

(c) number of field turns = field mmf per pole at full load + field current

(d) number of field turns = field mmf per pole at full load – field current

This question was posed to me by my school principal while I was bunking the class.

This is a very interesting question from Design of Field Winding in division Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right choice is (b) number of field turns = field mmf per pole at full load / field current

The explanation is: The field mmf per pole at full load is calculated from the voltage across each field coil. Next, the field current is calculated and from these values the number of field turns is calculated.