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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 460 V
 200 V
 115 V

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

None of these
 both A and B
 K × input power
 (1-K) × input power

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 220 V.
 240 V.
 280 V.
 150 V.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 less magnetic core loss.
  no magnetic core loss.
 more magnetic core loss.
  more copper loss.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  43 Amp.
 29 Amp.
 44.47 Amp.
  33.33 Amp.

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 both 1and 2
 hysteresis loss
 eddy current loss

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