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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 cast iron.
 fibre.
 silicon steel.

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide overload protection.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 192 V
 96 V
 384 V
 768 V

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 1000 rpm
 750 rpm
 3000 rpm

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

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

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce mechanical losses.
  to reduce hysteresis loss.
  to provide better flux linkage.
  to reduce eddy current loss.

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