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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?

 60°
 20°
 30°
 18°

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 440 A.
 44 A.
 400 A.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, shaded
 shaded, unshaded
 unshaded, unshaded
 shaded, shaded

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
 On yoke in the inter pole gap.
  On yoke in the pole faces.
 On armature.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  any of the above.
  double cage rotor.
  short-circuited rotor.

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