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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

 50 ohm.
  0.5 ohm.
  0.1 ohm.
 100 ohm.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thin
 large and thin
 less and thick

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 82.5%
 67.5%
 72.5%
 78.5%

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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?

 60 V.
 40 V.
 90 V.
 30 V.

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Electrical Machines
A generator may loose residual magnetism due to

  over excitation.
  heating.
  any of these.
  vibrations.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 remain unchanged.
 aprroach infinity.
 approach zero.
 between zero and infinity.

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