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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Delta - delta
 Star - star
 Star - delta

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 armature winding
 field winding
 interpole winding

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 50 KVA
 123.3 KVA
 83.33 KVA

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imax.
 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imin.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

  75°.
 45°.
 0°.
 30°.

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Electrical Machines
A smaller air gap in a induction motor helps to

 increase the starting torque.
 reduce the chance of crawling.
 reduce the magnetizing current.
 reduce the chance of cogging.

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