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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
Use of fractional pitch winding

All of these
  make it stiffer.
  results in reduced leakage reactance.
  results in reduced axial length of the machine.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 301 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 602 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Glass.
  Vacuum.
  Mica.
  Oil impregnated paper.

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Electrical Machines
A DC compound motor has

 tertiary winding.
 only series field winding.
 both shunt and series field winding.
 only shunt field winding.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
None of these
 Slip speed
 Synchronous speed

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