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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.05.
 20.
 1.1.
  0.905.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 load angle
 synchronous reactance
 both 1and 2
 excitation

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 2166.67V, 230 rpm.
 541.67V, 200 rpm.
 2166.67V, 270 rpm.
 541.67V, 250 rpm.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T ∝ V
 T∝ V²
 T ∝ 1/V

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the power factor.
 reduce the harmonics.
 start the motor.
 improve the starting torque.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 Ward Leonard control.
 rheostatic control.
 none of above.
 any of above method.

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