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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
  15 %.
  2.5 %.
 10 %.

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 magnetization
 demagnetization
 cross magnetization

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

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of flux.
 direction of motion of the conductor.
 opposite to the direction of motion of the conductor.
 direction of induced emf.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 ohmic loss.
 eddy current loss.
 both eddy current and hysteresis loss.
  hysteresis loss.

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 Induction machine
 DC machine
All of these

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