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Electrical Machines

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

 4 KVA
 6 KVA
 10 KVA
 0 KVA

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 a synchronous motor
 an induction motor
None of these
 an induction generator

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 load current
 both 2 and 3
 maximum flux density
 supply frequency

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 one fourth.
 double.
 half.
 4 times.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
 1920 Watt.
  980 Watt.
 1800 Watt.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 open type winding
 wave winding
 lap winding

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