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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
 zero
 minimum
All of these

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Closed slots.
  Open slots.
  None of above.

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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

 0.45 Ω.
 0.66 Ω.
  0.24 Ω.
 0.78 Ω.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 600
 40
 660
 60

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Electrical Machines
Regenerative braking is possible in

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

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
  1 at 90°C.
 0.5 at 90°C.
 3 at 90°C.

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