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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 any of the above
 parabola
 hyperbola

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  there is no load on the generator.
  the generator runs on full load.
  the generator runs on overload.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 increased.
  remains unchanged.
 kept constant to certain value.
 decreased.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 2KW
 1.5KW
 3KW

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.78 Ω.
 0.66 Ω.
 0.45 Ω.
  0.24 Ω.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 Increases.
 None of above.
 Remain unchanged

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