Question

If the no load test is conducted at its rated frequency but less than the rated voltage, then the mechanical losses will _____ and the constant losses will _________

(a) constant, reduce

(b) constant, rise

(c) reduce, rise

(d) constant, constant

I had been asked this question in my homework.

I'm obligated to ask this question of Circle Diagrams of Induction Machines in chapter Induction Machines of Electrical Machines

Answer 1

The correct choice is (a) constant, reduce

For explanation: Mechanical losses remain always constant, but the stator losses will reduce as the voltage has been decreased.