Why we use 11kv, 22kv, 33kv? Why not use 10kv, 20kv, 30kv?

Why transformer rating in KVA:-
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Difference between A.C and D.C:-
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Apparent power, Real power, Reactive power:-
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Difference between synchronous motor and induction motor:-
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Class-A Power amplifier:-
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Power Dissipation capacity, collector efficiency, distortion:-
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Disadvantages of low power factor:-
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