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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
  240 rpm.
  470 rpm.
 450 rpm.

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 convert ac armature current in to dc
 collecting of voltage
 reduce eddy current loss

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Increase.
 Oscillate around the normal speed.
 Remain unaltered.
 Reduce.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 armature connections.
 armature or field connections.
 series field connections.

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