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Electrical Machines

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

 decrease
None of these
 either increase or decrease
 increase

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.781 Ω.
 25.564 Ω.
 2.74 Ω.
  2.241 Ω.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  magnetic inertia.
  high field resistance.
  residual flux.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 more than 6 V
 less than 6 V
 6 V
 zero

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 660
 600
 60
 40

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 V²
 1/V
 1/V²

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