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Why DC has no inductance?
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A motor has to exert power starting from zero and rising uniformly to 150 HP in 8 mins after which it works at constant power of 100 HP for 5 mins. The motor remains on no load for next 5 mins. The cycle again starts and repeats indefinitely. Determine suitable size of motor.

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DC series motor should never be started at no load. Justify.

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Why power factor of the transformer under no load is very low?

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Why is the emf always even when no current is drawn through the battery?

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Does self-inductance occur if DC current is passed?

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Does self inductance occur if DC current is passed?

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Which meter has a greater sensitivity and why? Meter A having a range of 0-10 V and a multiplier resistance of 18 kΩ and meter B with a range of 0-300 V and multiplier resistance of 298 kΩ? Both meter movements have a resistance of 2 kΩ.

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State why a transformer always has an efficiency of more than 90%.

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Why does instrumentation amplifier has high input impedance?

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Why is mutual inductance equal?
Answer : Mutual inductance is equal because the inductive effect between two coils (or circuits) is the same whether you're considering the influence of coil 1 on coil 2, or vice versa. In simple terms ... similar properties (such as the same geometry, number of turns, and the same magnetic environment)....

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