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Electrical Machines

Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 flat tapped or trapezoidal
 sine wave
 peaky in nature

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of field flux on the armature flux.
 Effect of armature flux on the load.
None of these
  Effect of armature flux on the main field flux.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 interpole winding
 field winding
 interpole and compensating windings together

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 60 V.
 40 V.
 90 V.
 30 V.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  speed and voltage.
  load.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Resistance split phase
 Shaded pole
 Capacitor run

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