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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  mild steel.
  cast iron.
  stainless steel.

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 18°
 72°
 30°

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the shunt field
 in parallel with the series field
 in series with the shunt field
 in series with the series field

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 S
 1-S
 1/(1-S)

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  run in a direction opposite to previous one.
  get damaged.
  not run.

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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.
 44.47 Amp.
 29 Amp.
  43 Amp.

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