Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 high voltage DC to low voltage DC.
 none of these.
 Both AC to DC and DC to AC.

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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

 1, 4, 5
 1, 4
 2,3
 2, 3, 5

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