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Electrical Machines

Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 (NfL − NnL)/NnL.
 NnL − NfL.
 (NnL − NfL)/NfL.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce armature heating.
 Increase speed
 Reduce starting torque.
 Increase acceleration duration.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pi/Pc
 (Pi/Pc)2
 √(Pi/Pc)
 Pc/Pi

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing of frequency.
  speed can not be increased.
  decreasing of frequency.
  increasing number of poles.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 back emf is equal to twice of applied voltage.
 back emf is equal to applied voltage.
 none of above.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 less magnetic core loss.
  more copper loss.
  no magnetic core loss.
 more magnetic core loss.

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