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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 non reversing drive
 reversing drive
 both 1 and 2
None of these

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 192 V
 768 V
 96 V

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 maximum flux density
 supply frequency
 load current
 both 2 and 3

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Electrical Machines
Which of the following alternators contain large number of poles?

 Hydro alternators.
 Turbo alternators.
None of these
 Aame in both alternators.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  locking tendency is reduced.
  uniform torque.
  less noise.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series motor.
 DC shunt motor.
 DC shunt generator.
  DC series generator.

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