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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  cast iron.
  stainless steel.
  mild steel.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 100Ω
 50Ω
 10Ω
 200Ω

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

  18.
 50.
 80.
 36.

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Electrical Machines
Eddy current loss will depends on

 Frequency
 Thickness
 Flux density
All of these

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Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 differential compound motors.
 series motors.
 shunt motors.

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

 about 115°.
  about 75°.
 90°.
 0°.

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