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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
 total value.
 average value.
  maximum value.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Shaded pole.
  Split phase.
  Capacitor start.
  Capacitor run.

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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

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

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Synchronous motor.
  Stepper motor.
  Slip ring induction motor.
  DC differential compound motor.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 any of the above
 greater than
 less than
 equal to

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Eg vs Ia
 Vt vs load current
 Eg vs load current

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