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Electrical Machines

Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/√3, 1/3
 1/√3, 1/√3
 1/3, 1/3

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1920 Watt.
  980 Watt.
  1960 Watt.
 1800 Watt.

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Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
 Synchronous machine
 DC machine
All of these

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increase the maintenance and repair
All of these
 increases the design cost

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole winding
 armature winding
 interpole and compensating windings together

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