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Electrical Machines

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

  EbIa.
  EIa.
  EbIa2.
  none of these.

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Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 series motors
 shunt motors
 both B and C

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
 proportionate to MVA rating of transformers.
  same.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmax to Imax.
 Vmin to Imax.
 Vmin to Imin.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Split phase.
  Shaded pole.
  Capacitor run.
  Capacitor start.

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

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