1. Laminations of core are generally made of
2. In D.C. generators on no-load, the air gap flux distribution in space is
3. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave
4. The essential condition for parallel operation of two D.C. generators is that they have
5. Which of the following could be lamina proximately the thickness of laminations of a D.C. machine?
6. The rapid wear of brushes takes place due to
7. In case of D.C. machine winding, number of commutator segments is equal to
8. The insulating material used between the commutator segments is normally
9. The bearings used to support the rotor shafts are generally
10. If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to
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