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Electrical Machines

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

 equal to
 less than
 any of the above
 greater than

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Shunt.
 Cummulative compound.
 Series.
 Differently compounded.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC series motor.
 Separately excited DC motor.
 DC compound motor.
 DC Shunt motor.

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Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
None of these
 Xd = Xq.
 Xd < Xq.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Hysteresis motor.
  Stepper motor.
 Shaded pole motor.
 Reluctance motor.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 field winding will burn.
 machine will generate maximum voltage.
 the voltage generated will be zero.
 machine will generate maximum power.

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