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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  carbon.
  aluminium.
  phosphor bronze.

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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

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

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

  4.
 8.
 32.
 16.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature resistance control.
 Armature voltage control.
 Field control.
 Field diverter control.

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Electrical Machines
Series booster is a

  series wound DC generator.
 separately excited DC generator.
 permanent magnet DC generator.
 shunt wound DC generator.

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Electrical Machines
Satisfactory commutation of DC machine requires

All of these
 brushes should be of proper grade and size.
 brushes should smoothly run in the holders.
 smooth, concentric commutator properly undercut.

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