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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Star - delta
 Delta - delta
 Star - star

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 20 volts.
 40 volts.
 30 volts.
 10 volts.

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Electrical Machines
Which of the following relation is correct?

None of these
 Xd > Xq.
 Xd = Xq.
 Xd < Xq.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 1920W
 1820W
 2000W

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 72°
 18°
 30°

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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?

 100 ohm
 10 ohm
 0.2 ohm
 2 ohm.

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