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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 70° to 85°
 0°

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 5.7 kW, 8.7 kW.
 9.6 kW, 12 kW.
 9.3 kW, 9.3 kW.
  6.3 kW, 9.3 kW.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
  none of above.
  cross-magnetization as well as demagnetization.
 demagnetisation.

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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 ,5
 2, 3, 4, 5
 2, 3, 4
 1, 2, 3

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in parallel
 either of these depending on the design of the motor
 through inductive coupling
 in series

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
  Full load.
 None of these.
 No load.

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