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Electrical Machines

Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 0 KVA
 6 KVA
 10 KVA

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Electrical Machines
Armature reaction in DC generators will result in

 open circuit.
 increase in slip.
 reduction in generated emf.
 short circuit.

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Electrical Machines
Torque developed in the rotor is

 inversely proportional to slip
 not dependent on the slip
 either of these
 directly proportional to slip

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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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
 234 V
 6 V
 474 V

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Remains same.
 None of these.
  Decrease.
 Increase.

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