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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 parabola
 hyperbola
 any of the above

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs Ia
 Vt vs Ia
 Vt vs load current
 Eg vs load current

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  equalizing coils.
  external star-connected resistors.
  3 - Φ AC supply.
  DC supply.

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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 simple wave-winding ?

 PZL/4Sa²
 PZL/4S
 PZL/4Sp²
 PZL/ 4Sa

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to interconnect three voltage systems.
  to suppress harmonic and unbalance in voltage.
None of these
 to carry extra load.

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 induction process only.
 conduction process only.
 both A and B.

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