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Electrical Machines

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

 4 ang 1
 4 and 2
 2 and 1
 2 and 2

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Electrical Machines
The field system of an alternator is usually excited

  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.
  110 / 220 V AC.
  230 V AC.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 tape recorders
 personal computers as cooling fan
 food mixers
 wet grinders

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 MMf method.
 Synchronous impedance method.
 ZPF method.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque remains constant
 more and maximum torque decreases
 less and maximum torque decreases
 less and maximum torque increases

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 interpole region.
 throughout the air gap.
None of these
  region under main pole.

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