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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 4
 6
 2

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 625 W
 700 W
 650 W

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 1440, 1500.
 60, 1440.
 50, 1500.
  60, 1500.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Draw too much current.
  Develop excessive speed and damage itself.
 Open fuse or circuit breaker.
 Produce sparking at brushes.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave controlled
 half wave controlled
 half wave
 full wave

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 100 ohm
 10 ohm
 0.2 ohm

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