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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
 4 V
 2 V
 0 V

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
  3190 W, 5040 W.
 6000 W, 7000 W.
 100 W, 2000 W.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator field terminal.
 motor armature terminal.
 generator armature terminal.
 motor field terminal.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  cheaper in cost.
  lighter in weight.
  of low resistivity.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  double frequency currents in the rotor.
  heating of rotor.
All of these
  vibrations.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 2-S
 1-S
 S

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