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Electrical Machines

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

 60°
 45°
 30°
 10°

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Resistance split phase motor
 Capacitor start capacitor run motor
All of these

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

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

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1920 Watt.
 1800 Watt.
  980 Watt.
  1960 Watt.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

  460 A.
 570 A.
  340 A.
 250 A.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic no-load axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
  Magnetic neutral axis.

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