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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 30°
 20°
 60°

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and low reactance.
  high resistance and high reactance.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

All of these
 In order to get saturated.
 In order to not to get saturated.
 In order to get more flux.

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Electrical Machines
Diverters are used only in

 shunt motors
 series motors
 either of these
None of these

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Electrical Machines
Poles of DC machine are often laminated to

 reduce iron weight.
 reduce pulsation loss.
 dissipate more heat.
 reduce armature reaction.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  synchronous motor torque.
  DC motor torque.
  induction motor torque.
  induction generator torque.

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