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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

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

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Electrical Machines
The type of DC motor used for shears and punches is

  Cummulative compound motor.
 Differential compound motor.
 Series motor.
 Shunt motor.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 remain unchanged.
 reduce by 5 %.
 increase by 5 %.
 depend on other factors.

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 60 V.
 0 V.
 20 V.
 40 V.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 3000 rpm
 750 rpm
 1500 rpm

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to the square of armature current.
 Proportional to armature current.
 Inversely proportional to armature current.
  Constant.

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