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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.
 1.1.
  0.905.
 20.

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Electrical Machines
The armature shaft must be able to withstand

 bending moment due to weight of the armature.
 twisting strains due to transmission of torque.
All of these
 any unbalanced magnetic pull on the armature core.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  the generator runs on overload.
  there is no load on the generator.
  the generator runs on full load.

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Electrical Machines
Which type motors are preferred for lathes?

 DC shunt motors.
 Synchronous motor.
 Squirrel Cage induction motor.
 Either A or B.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 300 V.
 200 V.
 150 V.
  223.V.

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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?

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

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