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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  none of these.
  EbIa.
  EIa.

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to half the applied voltage.
 Back emf is equal to zero.
 Back emf is equal to applied voltage.
 None of above.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 0.2 ohm
 2 ohm.
 10 ohm
 100 ohm

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
All of these
 Iron loss
 Copper loss

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  stator winding.
None of these
  rotor winding.
  either stator winding or rotor winding.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, 950 rpm.
 zero, 950 rpm.
 zero , - 50 rpm.
 1000 rpm, - 50 rpm.

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