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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 decreases.
None of these
 increases.
 remains same.

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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

 50Ω
 10Ω
 100Ω
 200Ω

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor winding.
  Rotor mmf wave.
  Stator winding.
  Both rotor and stator winding.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 -3%
 +3.33%
 +3%

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
 same
 exactly opposite
None of these

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