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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 1000 rpm
 2000 rpm
 500 rpm

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

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

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with armature
 parallel with main poles
 parallel with armature
 series with main poles

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 0.1 Ω
 50 Ω
 100 Ω

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 reduction in main field flux
 reduces the terminal voltage
 commutation

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 over compound generator
 shunt generator
 series generators
 both B and C

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