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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 2 and 2
 4 ang 1
 4 and 2

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Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 eddy current loss.
 copper loss.
 both 1 and 2.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P³
 T∝ P²
 T∝ P
 T is independent of P

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

None of these
 increase.
 decrease.
 remains constant.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  less heating of the rotor.
  less heating of the rotor.
  all of these.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  star.
  delta.
  delta or star according to need.

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