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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Mild steel.
 Fibre.
 Cast iron.

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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?

 975 rpm
 1000 rpm
 940 rpm
 950 rpm

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Electrical Machines
A DC series motor has which of the following characteristics?

 Can be started easily without load.
 Has its field winding consinting of thick wire and less no of turns.
 Has a almost constant speed.
 Has a poor torque.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 in magnetic neutral axis.
 just behind the magnetic neutral axis.
None of these
 just ahead of magnetic neutral axis.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 interpole region.
None of these
 throughout the air gap.
  region under main pole.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 six.
 four.
 two.

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