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Electrical Machines

Electrical Machines
In synchronous motor the torque is proportional to

 1/P²
 P²
 Power P
 1/P

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.05+j5.08 ohms
 8+j13 ohms
 3.5+j5.8 ohms
 53+j85 ohms

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
  results in reduced axial length of the machine.
  make it stiffer.
All of these

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Electrical Machines
Lamination of core are generally made of

 carbon.
 silicon steel.
 stainless steel.
 cast iron.

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Electrical Machines
The stator frame in an induction motor is used to

  hold armature stamping in position.
  provide return path for the flux.
  ventilate the armature.
  protect the whole machine.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

  1 - Φ synchronous motor.
 3 - Φ induction motor.
 Stepper motor.
 DC motor.

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