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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EbIa.
  EIa.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 decrease
 increase
 either increase or decrease
None of these

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Electrical Machines
Alternator operates on the principle of

  self or mutual induction.
  mutual induction.
  self induction.
  electromagnetic induction.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
  about 75°.
 about 115°.
 0°.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 960 RPM
 970 RPM
 940 RPM
 920 RPM

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

 40%
 10%
 19%
 5%

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