Answer / sankaranarayanan

field flux produced by dc supply is constant where as in ac
supply will not give a constant field flux

So, alternator output will not constant.

Answer / kj

When a wire is moved through a magnetic field it produces a
voltage across the wire. To produce an ac output the wire
must move past a north pole and then a south pole in
continuing sequence.
A dc voltage on the field will maintain the poles with the
same polarity. An ac voltage will cause the polarity to
reverse 100 times a second (50Hz) and this will not be
usable for generating the ac output voltage.
Usually an ac voltage is used but it is rectified either as
half wave or full wave before being put into the field.

Answer / mohamed abd el-raouf

so the magnetic field of the rotor can connect with the magnetic field of the stator

Answer / haytham hashim

coz dc can be controlled in awide range but cann't be

What is the difference between AMF panel and DG Synchronization panel? please define the working of both the panels?

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what does kirlosker deals with?

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2 Answers  

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Sir I hv to fix 20 ton ac how much electrical power need apply?

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What is time response of the control system?

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what is meant by trivector meter?

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There is any especial requirement for motor to drive through with VFD?

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How is Grounding or Earthing achieved in Planes and Automobiles?

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how to claculate the ups load in KVA pls give the if any fourmoul?

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are there rmu for 3 transformer?

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