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Electrical Machines

Electrical Machines
Example of double excited machine is

 DC Shunt Motor
 Both are correct.
 Synchronous motor.
None of these

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.25 p.u
  0.125 p.u
  0.75 p.u
  0.5 p.u

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 4 and 2
 4 ang 1
 2 and 2

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Hysteresis losses
 All of the them
 Eddy current losses
 Friction and windage losses

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 applied voltage.
 resistance of armature culture.
 all of these.

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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.
 I1 = KI2.
  I1 = KI2 + Iw + Iμ.ok

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