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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 36
 72
 74

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 less than 90o.
 Greater than 90o.
 90o.
 0o.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Universal motor.
  Synchronous motors.
  Reluctance motor.
  Slip ring induction motor.

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Electrical Machines
Which of the following rotor requires damper winding?

None of these
 Both type rotor.
 Salient pole rotor.
 Cylindrical rotor.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The torque required.
 None of above.
 The speed of motor.
 The voltage across the terminals.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Series motor.
  Cumulative compound motor.
  Differential compound motor.

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