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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly decrease.
 not change.
None of these
 slightly increase.

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 maximum
 zero
 any of the above
 infinite value

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 6 V
 220 V
 more than 220 V
 somewhat less than 220 V

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Electrical Machines
In most condition which frame of motor will be preferred?

 Drip proof.
  Totally enclosed fan coiled.
 Open type.
 Splash proof.

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Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
 where greater load is connected.
 where constant speed is required.
  high current and low voltage applications.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 permanent magnet motor
 comulatively compounded motor
 series motor
 differentially compounded motor

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