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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
 14 HP.
  10 HP.
  13 HP.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 more than 30 W
 zero watt
 30 W
 less than 30 W

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 175 V
 140 V
 120 V

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Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 none of these.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  uniform torque.
  locking tendency is reduced.
  all of below.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv.
 Blv2.
 Bl2v.
 Bl2v2.

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