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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

  All of this.
 Blowers and fans.
 Centrifugal pumps
 Lathes.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 57.7%
 50%
 33.3%
 66.3%

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 increase
 decrease
None of these

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Electrical Machines
Armature of DC machine is made of

 non-ferrous material.
 conducting material.
 silicon steel.
 insulating material.

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
 Both 1 and 2.
None of these
 A small value of leakage reactance will increase the maximum power output of motor.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 80.
  18.
 36.
 50.

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