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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  all of below.
  less maintenance.
  simple in construction.
  less cost.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 975 rpm
 950 rpm
 940 rpm

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  30 %.
  2.67 %.
 1.5 %.
 5 %.

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 50 Hz
 25 Hz
 40 HZ
 60 Hz

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Shunt field resistance control.
 Armature resistance control.
 Armature voltage control.
 Any of above.

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