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Electrical Machines

Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
 None of the options.
  Series.
 Compound.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 No load.
 Low load.
  Full load.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

  reactance voltage.
 high resistance of carbon brushes.
 presence of commutator.
 armature reaction.

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Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.
  250 / 250 V DC.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 either GNA or MNA
 GNA
None of these

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 40 V.
 60 V.
 30 V.
 90 V.

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