Consider the statements regarding losses occurring in a dc machine.
1. Iron loss significantly depends on flux at the operating speed.
2. Iron loss is directly proportional to voltage, which is producing flux.
3. Copper loss vary as square of the current.
Which of the above statement are correct?
1
1 and 3 only
2
2 and 3 only
3
1 and 2 only
4
1, 2 and 3