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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 either increase or decrease
None of these
 increase

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  aluminium.
  stainless steel.
  silicon steel.

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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?

 200V
 10V
 100V
 20V

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Electrical Machines
In DC machine yoke offers

 flux path completion
 mechanical protection to the machine
 produce working flux
 both A and B

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 Ω
 5.7 Ω
 1.9 Ω
 6 Ω

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
 Air crafts.
 Used as boosters in dc distribution or transmission.
All of these

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