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Electrical Machines

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

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

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 900 rpm
 850 rpm
 950 rpm

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 66.3%
 50%
 33.3%
 57.7%

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Electrical Machines
Iron loss in a transformer mainly occurs in

 iron made tank of transformer.
 steel core in transformer.
 winding of transformer.
 transformer insulating oil.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 AC single phase motor.
 DC Shunt Motor
 Synchronous motor.

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