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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 2 and 1
 4 ang 1
 4 and 2

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  220 V.
  zero.
  about 2 V.

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Electrical Machines
In an ideal DC generator the regulation is

 zero.
 high.
 positive.
 low.

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Electrical Machines
A DC compound motor has

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

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Electrical Machines
During hunting of a synchronous motor

  negative phase sequence currents are generated.
  damper bar develops torque.
  field excitation increases.
  harmonic are developed in the armature circuit.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
 20.
  0.905.
  0.05.

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