NABTEB QUESTIONS

Explain how these faults (a. Failure to start. b. Sparking brushes) can be detected and the possible remedy. – NABTEB QUESTION

These faults were reported to have occurred on a D.C. Motor.

a. Failure to start.
b. Sparking brushes.

S/No FAULT CAUSE REMEDY
(a) Failure to start i. Open circuit on starter resistance.

Ii. Open circuit on-field circuit.

Change the starter resistance. Rewind the field winding.
(b) Sparking at brushes. (i) Open circuit.

(ii) Shorted or earthed armature coil.

(iii) Wrong brush position.

(iv) Motor overloaded.

(v) Dirty or worn out commutator.

Proper connection

Proper lamination and insulation.

Proper position.

Reduce the load.

Clean the commutator or replace the commutator.

 

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