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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 25 Hz
 0 Hz
 100 Hz

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Electrical Machines
At stand still condition the value of slip is

 infinite value
 1
 0
 finite value

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1, 2 and 3
 1 and 3
 1 and 2
 2 alone

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  none of above.
 demagnetising.
  magnetising.
  crossmagnetising.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 both of above.
 AC.
 DC.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 improve starting torque
 decrease starting torque
 reduce magnetising current and improve power factor
 increase pull out torque

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