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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

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

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 flat-topped
 co- sinusoidal
 rectangular

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 high maintenance cost.
 poor overall efficiency.
 high initial cost.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
  series motor.
 AC synchronous motor.
 shunt motor.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 field winding
 interpole and compensating windings together
 interpole winding
 armature winding

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Electrical Machines
Which of the following rotor requires damper winding?

 Both type rotor.
 Salient pole rotor.
 Cylindrical rotor.
None of these

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