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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 40%
 19%
 5%

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
  induction generator.
 synchronous motor.
 synchronous generator.

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 NnL − NfL.
 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  33.33 Amp.
 29 Amp.
  43 Amp.
 44.47 Amp.

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Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 rated transformer current
 rated transformer voltage
 high frequency supply

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 increase
 remain the same
 decrease

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