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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 1/S
 1/(1-S)
 S

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Electrical Machines
The principle of dynamically induced emf is utilized in

 transformer.
 generator.
 thermocouple.
 choke.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

  increased.
 decreased.
 remains same.
 kept constant to certain value.

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Electrical Machines
At stand still condition the value of slip is

 finite value
 0
 1
 infinite value

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 commutator
 starters
 field winding

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Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Hysteresis loss
 Magnetic loss
 Copper loss

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