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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmin to Imin
 Vmin to Imax
 Vmax to Imin

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 4.
 3.
 7.
  12.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 0.08
 -0.08
 -1.92

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the series field
 in series with the shunt field
 in parallel with the shunt field
 in parallel with the series field

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 53+j85 ohms
 3.5+j5.8 ohms
 8+j13 ohms
 3.05+j5.08 ohms

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