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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
 Running Torque.
 Starting torque.
  Effiency.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
 differentially compounded.
  cumulatively compounded.
  shunt connected.

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 lubrication.
 cooling.
  insulating.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Slip ring induction motor.
  Reluctance motor.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

  4.
 32.
 8.
 16.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1037.5 r.p.m.
 4575.4 r.p.m.
 1130 r.p.m.
 none of above.

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