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Electrical Machines

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

 rectangular
 flat-topped
 sinusoidal
 co- sinusoidal

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4
 2, 3, 4, 5
 1, 2, 3
 2, 3 ,5

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in none of above positions.
  in any of above positions.
  along field axis.
  along neutral axis.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may run away.
 the starting torque becomes low.
 the starting current will be enormously high.
 the motor may not start.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 115 V
 230 V
 460 V
 65 V

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same phase sequence
 same voltage magnitude
 same prime mover speed
 same frequency

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