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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 60°
 45°
 10°

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

None of these
  stator phases of the motor.
  starting resistance in the starter.
  rotor at slip rings.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 72°
 30°
 36°

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as Xs2
All of these
 inversely as 1/Xs
 directly as synchronous reactances Xs

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P³
 T is independent of P
 T∝ P²
 T∝ P

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Both B and C.
  Electromagnets.
 None of the options.
 Permanent magnets.

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