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Electrical Machines

Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  triangular.
  rectangular.
  pulsating.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 and 2
 1 and 3
 2 and 3
 1 alone

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Series Motor
 Separately Excited DC Motor
 Compound Wound DC Motor
 DC Shunt Motor

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Electrical Machines
Which of these types of motor is self starting?

  None of these.
  Poly-phase synchronous machine.
  Poly-phase induction motor.
  Single phase induction motor.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 200V
 10V
 100V

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 synchronous motor.
 dc shunt motor.
 slip ring induction motor.

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