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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 70° to 85°
 0°
 25° to 30°

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Three phase IM.
  Single phase IM.
  Slip ring IM.

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

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

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 increase in slip.
 short circuit.
 open circuit.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 motor field terminal.
 generator field terminal.
 generator armature terminal.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  any one of the connection.
  series.
  no resistance is connected.
  parallel.

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