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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  1/Ia.
  √Ia.
  Ia.

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

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
None of these
 rotor resistance
 supply frequency

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Electrical Machines
In above question, find rms line voltage for delta connection?

 50 V.
 100 V.
 399 V.
  230.2 V.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  either stator winding or rotor winding.
  stator winding.
  rotor winding.
None of these

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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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