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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.
 230 V.
 200 V.
 460 V.

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Electrical Machines
Exciting current of an induction motor is

  higher than power transformer.
  lesser than power transformer.
  equal as power transformer.
  none of these.

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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 external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.9 Ω
 31.1 Ω
 15.1 Ω

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Cummulative compound motor.
 Shunt motor.
 Series motor.

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Electrical Machines
In synchronous motor the torque is proportional to

 Power P
 1/P²
 1/P
 P²

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.28 Nm
 15.6 Nm
 Zero
 16.55 Nm

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