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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
  speed and voltage.
  voltage.
 speed.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
All of these
 4 point starter
 2 point starter

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  not run.
  get over heated.
  make noise.

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

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

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.
 DC.
  DC of slip frequency.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 applied voltage V
 1/V²
 1/V
 V²

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