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Electrical Machines

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

 two.
 three.
 six.
 four.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  Ia2.
  1/Ia.
  √Ia.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmin to Imax
 Vmax to Imin
 Vmin to Imin

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Electrical Machines
Which type of motors uses slip rings?

 DC Shunt Motor
 Synchronous motors
 Induction motors
 Both Synchronous and Induction motor

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase efficiency under light load conditions
 Increase in reliability
All of these
 continuity supply is maintained

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Electrical Machines
Transformer core is laminated to reduce

 copper loss.
 eddy current loss.
 hysteresis loss.
 both 1 and 2.

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