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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 975 rpm
 950 rpm
 1000 rpm

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

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

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Electrical Machines
A DC generator can be considered as

 prime mover.
 rotating amplifier.
 rectifier.
 power pump.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  external star-connected resistors.
  DC supply.
  equalizing coils.
  3 - Φ AC supply.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 armature or field connections.
 shunt field connections.
 armature connections.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 run at very low speed.
 start haunting.
 run at very high speed.

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