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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  60 Hz.
  50 Hz.
  25 Hz.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Adding resistance to field circuit.
 Reversing armature connection or field connection.
 Interchanging armature and field connection.
 Reversing supply connection.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 excitation and load angle
 supply voltage, load angle and excitation
 supply voltage and load angle
 supply voltage and excitation

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 carbon.
 cast iron.
 silicon steel.

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 peaky in nature
 flat tapped or trapezoidal
 sine wave

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

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

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