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Electrical Machines

Electrical Machines
Example of double excited machine is

 DC Shunt Motor
None of these
 Both are correct.
 Synchronous motor.

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

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

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 stationary
 rotates opposite direction
 rotates same direction
None of these

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature voltage control.
 Any of above.
 Shunt field resistance control.
 Armature resistance control.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 133.22 N-m
 266.20 N-m.
 can not be determined.
 234.76 N-m.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)

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