Q. If in the DC machine, the reversal of current in the coil is faster than ideal or linear commutation then the commutation is said to be __________ commutation.

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Q. For a DC machine, in a commutator ________

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Q. The insulating material used between the commutator segments is normally _______

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Q. Why interpoles are tapered in a DC machine?

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Q. The main function of interpoles in a loaded DC machine is to minimize _______between the brushes and the commutator.

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Q. Which of the following is different component?

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Q. How many coils under an adjoining pole pairs is/are connected between adjacent commutator segments in lap winding?

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Q. In wave winding, P/2 coils are connected under the influence of “x” pole-pairs which connect adjacent segments. X is ____

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Q. The process of current reversal takes place when the coil is passing through the interpolar region.

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Q. How many coil sets undergo commutation simultaneously in a wave winding?

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Q. Which coil is shorted in commutation process?

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Q. Ideal commutation can be shown graphically by _____________

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Q. Which winding has large number of turns?

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Q. Which winding contains wire with higher thickness?

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Q. Which winding have higher resistance?

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Q. Which is more practical method used in control of series field?

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Q. In compound excitation, which winding/s is/are excited?

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Q. In which type of excitation air gap flux increases with armature current?

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Q. In differential compound excited machine, what is the variation in air gap flux per pole with respect to armature current?

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Q. Which winding in compound excitation is responsible for change in air gap flux per pole?

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