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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 950 rpm
 850 rpm
 1000 rpm
 900 rpm

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.62.
 0.25.
 0.72.

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Electrical Machines
An induction motor is, in general analogous to

None of these
 two winding transformer with secondary open circuited.
 auto transformer.
 two winding transformer with secondary short circuited.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the mass.
 to reduce the eddy current loss.
 to reduce the inductor.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
 supply frequency
 rotor resistance
None of these

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  DC supply.
  external star-connected resistors.
  equalizing coils.

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