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Electrical Machines

Electrical Machines
Example of double excited machine is

 Synchronous motor.
 DC Shunt Motor
 Both are correct.
None of these

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 1.0.
 3 to 5.
 2 to 3.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 Ia
 I/Ia2
 Ia2

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sp²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  s2.
  sf / 2.
  sf.

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

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

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