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What is the formula for RPM and poles?
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Explain what are inter-poles and why they are required in a dc machine.

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Explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.

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Why an ac solenoid valve attract the plunger even though we interchanges the terminal? Will the poles changes?

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The power input to a 500V 50Hz 6Pole 3 phase induction motor running at 975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses are 2kW. Calculate: (i) Slip (ii) Rotor copper loss (iii) Shaft power (iv) Efficiency

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What is the formula for the relationship between electric flux and electric field?

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What is the formula for Delta and star connected system?

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What is the formula for Delta and Star connected system?

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What is the formula for active reactive and apparent power?

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What is the formula for permeability and permittivity?

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