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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

  All of this.
 Lathes.
 Centrifugal pumps
 Blowers and fans.

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Electrical Machines
φA 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 speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 920 RPM
 970 RPM
 960 RPM
 940 RPM

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  medium.
  low.
  high.
  zero.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 100V
 200V
 20V

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
  salient.
 non uniform cylindrical.
 none of these.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the mass.
 to reduce the inductor.
 to reduce the hysteresis loss.

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