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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 copper loss.
 hysteresis loss.
 eddy current loss.
 both 2 and 3.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 permanent magnet motor
 series motor
 comulatively compounded motor
 differentially compounded motor

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 armature circuit
 shunt field
 both A and B
 none of above

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Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
 dynamically and statically induced emf.
None of these
 statically induced emf.

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Electrical Machines
Transformer action requires a

 alternating electric flux.
 increasing magnetic flux.
 alternating magnetic lux.
 constant magnetic flux.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

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

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