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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

 √3
 3
 1/3
 1/√3

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
 0.443.
  0.573.
 0.649.

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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

 175 V
 120 V
 140 V
 240 V

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 compensating winding.
 damping winding.
  common winding.

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Electrical Machines
The condition for maximum running torque is

 unity
 0.5 lagging
 zero
 R = S.X
 0.707 lagging

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 both Eb and Td are zero
 Eb is zero, but Td is unchanged
 Eb is unchanged, but Td is zero

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