Q. The most likely cause(s) of sparking at the brushes in a DC machine is /are ____________

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Q. Each of the following statements regarding interpoles is true except______________________

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Q. Axis undergo shifting as a result of armature reaction, can be balanced by ______

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Q. The choice of average coil voltage determines the minimum number of commutator segments for its design.

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Q. Compensating winding will provide incomplete neutralization ____________

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Q. Cross-magnetizing effect of armature reaction can be reduced by __________

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Q. To counter the effect of shift in MNA due to armature reaction, which of the following component can be shifted?

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Q. Calculate the number of conductors on each pole piece required in a compensating winding for a 6-pole lap-wound dc armature containing 286 conductors. The compensating winding carries full armature current. Assume ratio of pole arc/ pole pitch = 0.7.

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Q. A compensating winding with ampere-turns greater than peak ampere turns is required in order to neutralize the effect of armature reaction because _____________

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Q. If pole arc is less than pole pitch, a compensating winding will have ampere-turns _________ (compare to peak ampere turns).

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Q. What is the pole arc/pitch ratio, if 360 AT compensating winding is used where 1960 AT is peak value?

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Q. Only drawback of compensating winding is _______

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Q. Resultant ampere-turn distribution of a DC machine is given by _________

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