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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  zero.
  about 50 V.
  220 V.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = ωm
 ωe = 2*ωm

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

 peaky in nature
 saddle shape
 sine wave
 flat tapped or trapezoidal

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Star side lags by -30°.
 Star side leads by 30°.
  Delta side lags by -30°.
 Delta side leads by 30°.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  delta connection.
  zig - zag connection.
  star connection.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

None of these
 unity power factor.
 leading power factor.
 lagging power factor.

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