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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  linear.
  cage.
  wound.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

None of these
 oscillating
 steady and unidirectional
 pulsating and unidirectional

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 to provide large flux.
 in order to reduce eddy current to provide large flux.
 as it carries large load current.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 DC.
None of these
 AC.
 both of above.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 100Ω
 50Ω
 200Ω

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Decreasing the field current.
 Increasing the armature current.
 Increasing the field current.

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