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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 flat-topped
 sinusoidal
 co- sinusoidal

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Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
 Mild steel.
  Fibre.

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Electrical Machines
_____________ types of induction motor are widely used.

  Slip ring IM.
  Three phase IM.
  Squirrel cage IM.
  Single phase IM.

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
All of these
  results in reduced axial length of the machine.
  results in reduced leakage reactance.

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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?

 30 V.
 40 V.
 60 V.
 90 V.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 heavily loaded and over excited
 heavily loaded and underexcited
 lightly loaded and over excited

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