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Electrical Machines

Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL − NfL.
 NnL/NfL.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 340 A.
 250 A.
 440 A.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
 3 - phase to ground fault.
  line to ground fault.
 3 - phase fault.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.05.
  0.1.
  1.0.

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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
which of the following type of brush and their application is/are correct

 carbon brush → normal ratings
 electro graphite → large ratings
 copper graphite → low voltage high current density
All of these

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