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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 30 volts.
 40 volts.
 20 volts.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  none of these.
  modified.
  reversed.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 AC single phase motor.
 DC Shunt Motor
 Synchronous motor.
 Induction motor.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 open fuse or circuit breaker.
 develop excessive speed and damage itself.
 produce sparking at brushes.
 draw too much current.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Remain unaltered.
  Reduce.
  Oscillate around the normal speed.
  Increase.

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