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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Hysteresis loss
 Magnetic loss
 Eddy current loss

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ P.
 T2 ∝ P3.
 T ∝ √P.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea + Iara
 Vt= Ea– Iara
 Vt = Ea + Ia(ra + rs)
 Vt = Ea + Iara+ ILrs

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

 over commutation.
  under commutation.
  any of the above.
  too rapid reversal of current.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 3
 1, 2 and 3
 1 and 2

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Supply voltage.
  Field excitaion.
  Armature voltage.

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