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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
 4 V
 0 V

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Small and constant load.
  Over-excitation.
  Periodic variation of load.
  Over-loading for long period.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant hp drive below the base speed.
 constant torque drive above the base speed.
 constant power drive above base speed.
 constant torque drive below the base speed.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  Ia.
  1/Ia.
  Ia2.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  repulsion motor.
  transformer.
  asynchronous motor.
  shunt motor.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 development of torque
 generation of voltage
 electromechanical energy conversion

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