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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?

 900 rpm
 1000 rpm
 850 rpm
 950 rpm

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
  0.1 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
The application that need frequent starting and stopping is

  jaw crushers.
  paper mills.
  lifts and hoists.
  blowers.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Both Compensating and Commutating pole winding.
 Commutating pole winding.
 Compensating winding.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Increase.
 Remain unaltered.
 Reduce.
 Oscillate around the normal speed.

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