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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
  rotor shaft.
  pole faces.
None of these

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

  256.4 V.
 271.7 V.
 238.2 V.
 240 V.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 pole core.
 under trailing pole tip.
 under leading pole tip.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 200%
 increase by 100%
 remain unaltered
 reduced to half

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Universal motor.
 Slip induction motor.
 Partial motor.

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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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