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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.
  50 Hz.
  60 Hz.
  25 Hz.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 increase and decrease respectively
 decrease and increase respectively
 both decrease
 both increase

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 230 V.
 460 V.
 200 V.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in field coil.
  increase the speed of shaft rotation.
 increase the number of turns in armature coil.

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
 constant speed operation.
 low starting torque operation.
  high starting torque operation.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
 0.443.
 0.512.
  0.573.

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MORE MCQ ON Electrical Machines

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