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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 400 A.
 44 A.
 440 A.
  40 A.

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Electrical Machines
Series booster is a

 shunt wound DC generator.
 separately excited DC generator.
 permanent magnet DC generator.
  series wound DC generator.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to applied voltage.
 back emf is equal to half of applied voltage.
 none of above.
 back emf is equal to twice of applied voltage.

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)2 × full Load.
  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc)1.6 × full Load.
 (Pi / Pc) × full Load.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iw.

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Electrical Machines
A generator may loose residual magnetism due to

  over excitation.
  heating.
  any of these.
  vibrations.

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