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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  none.
  larger output.
  both.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing any two leads from supply.

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  aluminium.
  carbon.
  stainless steel.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 either of these.
None of these
 increase.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

 (1 / 15) times the synchronous speed.
  (1 / 5) times the synchronous speed.
  0.5 times the synchronous speed.
 5 times the synchronous speed.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
 300 V.
 200 V.
  223.V.

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MORE MCQ ON Electrical Machines

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