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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 half load
 full load
 no load

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  Ia2.
  √Ia.
  Ia.

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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.

 both A and B
 armature circuit
 shunt field
 none of above

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 140 V
 120 V
 175 V

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 both B and C
 shunt generator
 over compound generator

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 0.25.
 0.5.
 near to 1.

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