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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  0.54.
  1.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing field electric current as well as direction of rotation.
 reversing the field current.
 increasing field current.
 any of above.

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and low voltage
 low current and high voltage
 high current and high voltage
 high current and low voltage

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Electrical Machines
On what factors the speed of dc motor depends?

 Field flux.
 Armature current Ia.
 All of these.
 Applied voltage.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
 16.
  4.
 32.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 250 rpm
 500 rpm
 2000 rpm

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