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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 2 V
 4 V
 1 V

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
  reduces the saturation magnetization.
  increases the hysteresis loss.
None of these

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 44 A.
 440 A.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 increase and decrease respectively
 decrease and increase respectively
 both increase
 both decrease

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will becomes four times.
 It will remain the same.
  It will be halved.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 load angle.
 frequency.
 both 1 and 2.

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