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Electrical Machines

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

 three.
 six.
 four.
 two.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3000 rpm.
  3600 rpm.
  4000 rpm.
  1500 rpm.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 less than 50%.
 same.
 between 50% and 90%.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine A
 none of these
 machine B
 any of the two machines

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Electrical Machines
Commutators in DC machines have a role of which converts

 high voltage DC to low voltage DC.
 none of these.
 AC to DC.
 Both AC to DC and DC to AC.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
 On yoke in the inter pole gap.
  On yoke in the pole faces.
 On armature.

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