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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 50 Hz
 25 Hz
 60 Hz

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Electrical Machines
Secondary winding of an auto transformer is also called

 damping winding.
 compensating winding.
 tertiary winding.
  common winding.

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Electrical Machines
Which of the following generators are used in arc welding?

 cumulative compound generators
 series generators
 differential compound generators
 shunt generators

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Electrical Machines
Copper brushes in DC machine are used

 where low voltage and high currents are involved.
None of these
 in both of above cases.
 where high voltage and low current.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 20 V.
 60 V.

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Electrical Machines
At slip s = 1 torque developed in machine is

  maximum torque.
  none.
  starting torque.
  electromagnetic torque.

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