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ELECTRICAL MACHINES QUIZ

Transformer oil is used as

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Hysteresis loss will depends on

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A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

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In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

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In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

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A short circuit test on a transformer gives

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In alternator, the rotary part is

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In which of the following generators negative voltage regulation can occur?

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The self induced emf in the coil undergoing commutation is called the

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If starter is not used with large DC motor for starting, it will

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