Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P*ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.
 power factor and supply voltage during hunting.
 supply voltage and excitation current at constant load.

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