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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 460 V.
 230 V.
 200 V.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Increase.
 Remain unaltered.
 Reduce.
 Oscillate around the normal speed.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 As a separate unit.
 In parallel with the armature winding.
  In series with the armature winding.
 In parallel with the field winding.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 240 V
 6 V
 474 V
 234 V

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Electrical Machines
The functions of inter poles are

 nullify reactance voltage and improve the commutation.
None of these
 reduce cross magnetization effect and improve commutation
 both 1 and 2

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Electrical Machines
Counter emf of a DC motor

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

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