Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

 Direction of rotation cannot be changed.
  Rotation can be changed by reversing main winding terminals.
 None of these.
 Rotation can be changed by interchanging supply terminals.

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

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