Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Any where between 75 % and 90 %.
 Around 90 %
 Less than 50 %

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Electrical Machines
Compensating windings are used in DC generators

  to provide path for the circulation of cooling air.
None of these
  mainly to reduce the eddy currents by providing local short circuit.
  to neutralize the cross magnetizing effect of the armature reaction.

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Electrical Machines
A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is

 1, 4, 5
 2, 3, 5
 2,3
 1, 4

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