Electrical Machines
The armature shaft must be able to withstand

All of these
 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.

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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
 1, 4
 2, 3, 5
 1, 4, 5

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