Question

How is the number of armature slots associated with the leakage reactance?

(a) small number of slots leads to less leakage reactance

(b) small number of slots leads to high leakage reactance

(c) large number of slots leads to high leakage reactance

(d) large number of slots leads to low leakage reactance

I have been asked this question during an online exam.

Asked question is from Armature Design topic in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right answer is (a) small number of slots leads to less leakage reactance

For explanation I would say: When the number of slots is small the leakage flux is increased. As the leakage flux is increased, the leakage reactance is increased owing to conductors lying near each other.