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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa.
  EIa.
  EbIa2.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 Compounded DC generator.
 DC series generator.
 None of these.

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 DC Shunt Motor
 The speed will increase abruptly.
 The speed will increase in proportion to reduction in load.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 Applied voltage.
 All of these.
 Field flux.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
 Armature.
 Yoke.
  Commutator.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Ampere's law.
 Fleming's right hand rule.
 Lenz's law.
  Fleming's left hand rule.

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