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Electrical Machines

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

 1/√3
 1/3
 √3
 3

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Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 brass
 copper
 hard-drawn copper

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 any of above.
 severe sparking.
 rough commutator surface.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 copper loss
 both 1and 2
 hysteresis loss

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Electrical Machines
Poles of DC machine are often laminated to

 reduce armature reaction.
 dissipate more heat.
 reduce iron weight.
 reduce pulsation loss.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

  Capacitor run type.
 Shaded pole type.
 Capacitor start.
 Split phase type.

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