Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
None of these
 either of these
 squirrel cage induction motor

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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

 field resistance was higher than critical resistance
 there was a break in the armature circuit
 field winding was wrongly connected
 there was no residual magnetism in the field circuit

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