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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/(1-S)
 1-S
 1/S

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.6 Nm
 15.28 Nm
 Zero
 16.55 Nm

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be 12.5%
 remain unchanged
 be more than 10%
 be less than 10%

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4Sp²

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Electrical Machines
Universal motor have which of the following application?

  Traction.
  Domestic pump.
  Lift.
  Food mixer.

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Electrical Machines
High starting torque and low starting current is the advantage of

  slip ring induction motor.
  squirrel cage induction motor.
  stepper motor.
  hysteresis motor.

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