Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 Low short circuit current
 Good voltage regulation
None of these
 High voltage regulation

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Electrical Machines
A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is

 2, 3, 5
 1, 4
 1, 4, 5
 2,3

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will rise.
  worsen and terminal voltage will fall
  improve and terminal voltage will rise .
 improve but terminal voltage will fall.

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