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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at normal speed.
 burn.
 run at lower speed.

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Electrical Machines
A compound motor has

  only series field winding.
  both shunt and series field winding.
  only shunt field winding.
  tertiary winding.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 45°
 60°
 10°

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Both wave and lap winding.
 Lap winding.
 No wave and lap winding.

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Electrical Machines
On what factors the speed of dc motor depends?

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

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 3.76%.
 2.56 %.
 4.76%.

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