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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  mild steel.
  aluminium.
  cast iron.
  stainless steel.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 0.2 ohm
 10 ohm
 2 ohm.
 100 ohm

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Terminal voltage is same
 Frequency should be same
 Both 1and 2

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 f
 V
 V2

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 decrease
 increase to rated voltage and then may decrease
 remain nearly constant

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor.
  Shunt motor as well as compound motors.
  Shunt, compound and series motor.
  Series motor.

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