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Electrical Machines

Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 500W
 3000W
 1000W
 100W

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 4 point starter
All of these
 3 point starter
 2 point starter

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Multiple voltage control.
 Field control.
 Armature control.

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

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

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed rises.
 improve and the speed rises.
 deteriorate and the speed falls.
 improve and the speed falls.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 Permanent magnets.
 None of the options.
 Both B and C.

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