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Electrical Machines

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

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

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²
 PZL/4SP²

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a variable speed motor.
  It is a constant speed motor.
 It is a high reluctance motor.
 It is a step angled motor.

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Electrical Machines
In DC generator, brushes are always placed along

 geometrical neutral axis.
 load axis.
  magnetic neutral axis.
 armature axis.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 266.20 N-m.
 234.76 N-m.
 cant be determined.
 133.22 N-m

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Electrical Machines
Stepper motor is used in

 computer printers
All of these
 traction
 food processing

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