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Electrical Machines

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

 both 1 and 2
 wave winding
 lap winding
None of these

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%
None of these

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 1/3
 √3
 1/√3

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 No load.
 Low load.
  Full load.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
  line to ground fault.
 line to line fault.
 3 - phase fault.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 either of these.
 decrease.
 increase.
None of these

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