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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

All of these
 Synchronous machine
 DC machine
 Induction machine

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Electrical Machines
Which of the following is not a part of transformer?

 Tap changer.
  Commutator.
 Conservator tank.
 Radiator.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 more than 6 V
 zero
 6 V

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 sin (α/2)
 Cos α²
 Cos α

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  25 Hz.
  60 Hz.
  16.67 Hz.

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Electrical Machines
A series motor is efficiently suitable for

 constant speed operation.
 low starting torque operation.
  high starting torque operation.
 none of these.

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