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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 35°C.
 32°C.
 27°C.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Decreasing the field current.
 Increasing the field current.
 Increasing the armature current.
 Increasing the field current.

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Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 cast iron.
 mild steel.
 fibre.

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Electrical Machines
Which of the following motor is used in grinders?

  Split phase IM.
  Capacitor start capacitor run IM.
  Synchronous motor.
  Capacitor start IM.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running torque.
  ratio of starting to running current.
  ratio of input to output voltage.
  efficiency.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 both A and B.
 rating of generators should be same.
 terminal voltage should be same.

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