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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
All of these
 zero
 maximum

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 rectangular
 sinusoidal
 co- sinusoidal

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Eddy current losses
 Hysteresis losses
 Both 1 and 2

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 regulates its armature voltage.
 aids applied voltage.
 helps in energy conversion.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 2
 4

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