Q. Which of the following are effects of armature reaction?

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Q. A 250 kW, 400 V, 6-pole dc generator has 720 lap wound conductors. Armature current is ____

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Q. What is the total ampere conductors/pole (in SI) if 600 lap wound conductors carry 120 A current through conductors (P=4)?

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Q. What is the total ampere turns/pole (in AT/pole) if 600 lap wound conductors carry 120 A current through conductors (P=4)?

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Q. If total ampere turns per pole is equal to 6000 A-turns, peak ampere turns for a 4-pole machine is _____

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Q. What is the total ampere turns per pole for 720 lap wounded conductors with carrying armature current equal to 625 A in a 6-pole machine?

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Q. For 6252 AT/Poles, if brush shift is of 2.50 mech. Degrees, what will be the demagnetizing ampere-turns per pole for a 6-pole DC machine?

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Q. For 6252 AT/Poles, if brush shift is of 2.50 mech. Degrees, what will be the cross-magnetizing ampere-turns per pole for a 6-pole DC machine?

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Q. The armature reaction in a DC machine causes distortion in the main field flux. Effect of armature reaction can be reduced by_________

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Q. In order to neutralize armature mmf perfectly under the pole shoe, the ampere-conductors of compensating winding must be (pole arc/pole pitch=1) _______

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Q. What is the ampere turns per pole for compensating winding in DC machines?

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Q. Where are no equalizer rings connected?

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Q. Inequality in brush arm currents caused due to different emf induced in different parallel paths may give rise to copper losses. These effects can be avoided by using _________

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Q. Which of the following method will completely neutralize the armature reaction in a DC machine?

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Q. What is the exact location of compensating winding?

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Q. Exact purpose of compensating winding in a DC generator is _________

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Q. Function of interpole flux is_________

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Q. Why dummy coils are connected in DC machine?

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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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