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Electrical Machines

Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 armature.
 none of these.
 core.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 230 V
 some what more than 230 V
 some what less than 230 V
 not possible

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

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

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 DC Series Motor
 Separately Excited DC Motor
 Compound Wound DC Motor

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 decrease
 either increase or decrease
 increase
None of these

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
  restoring torque.
 synchronizing power co efficient.
 mechanical rotatory system.

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