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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 both 1 and 2
 lap winding
 wave winding

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 high efficiency.
 reduced size.
  quick acceleration.
 low starting torque.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 100%
 increase by 200%
 reduced to half
 remain unaltered

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 4KVA
 0KVA
 20KVA

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Cummulative compound.
 Shunt.
 Differently compounded.
 Series.

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