Electrical Machines
Which of the following is/are effects of armature reaction?

 increases the design cost
 increase the maintenance and repair
 increase the iron loss
All of these

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

 generator 1 gets over load
 200 MW and 400MW respectively
 generator 2 gets over load
 230.7 MW and 369.23 MW respectively

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Any of above.
 Inserting an additional resistance in the armature circuit.
 Inserting an additional resistance in the field circuit.
 Inserting resistance to armature circuit and field circuit.

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field resistance was higher than critical resistance
 field system lost residual magnetism
 there was a break in the armature circuit
 field winding was wrongly connected

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