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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 950 rpm
 850 rpm
 900 rpm

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
  results in reduced leakage reactance.
  results in reduced axial length of the machine.
All of these

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and low reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Blowers and fans.
  All of this.
 Lathes.

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Electrical Machines
Breather is provided in a transformer to

  absorb moisture of air during breathing.
 filter the transformer oil.
 provide cold air in transformer.
 absorb moisture from air entering in transformer.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 60 V.
 90 V.
 40 V.
 30 V.

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