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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 0 V
 4 V

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Running Torque.
 Starting torque.
 Speed regulation.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 51.5Hz
 1.5Hz
 2.5Hz
 48.5Hz

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 component of armature mmf along field axis
 non-sinusoidal nature of armature mmf
 magnetic saturation in half of the field pole
 uneven air-gap length

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with armature resistance.
 DC compound motor.
 DC series motor.
 DC shunt motor with field weaking control.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 None of above.
 increase.
 not change.
 decrease.

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