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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  less than 1 %.
  zero.
 4 %.

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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.
 40 V.
 60 V.
 30 V.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imin.
 Vmin to Imax.
 Vmax to Imin.
 Vmax to Imax.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with armature
 series with main poles
 parallel with main poles
 parallel with armature

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  AC slip ring motor.
  DC series motor.
  Synchronous motor.

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of crawling.
 increase the starting torque.
 reduce the chance of cogging.
 reduce the magnetizing current.

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