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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Traction.
  Food mixer.
  Lift.

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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?

 90 V.
 60 V.
 40 V.
 30 V.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Field flux.
 Armature current.
 All of these.
 Applied voltage.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 60, s = 0.96 %.
  P = 50, s = 4.43 %.
  P = 40, s = 5.79 %.

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Electrical Machines
Which of the following statements are correct ?

None of these
 The leakage reactance of the induction motor should be small.
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically induced emf.
None of these
 dynamically and statically induced emf.

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