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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?

 4 V
 2 V
 1 V
 0 V

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
 field current control
 armature circuit resistance control
All of these

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 350 V.
 480 V.
 400 V.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 50Ω
 200Ω
 10Ω
 100Ω

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
  Commutator.
 Armature.
 Yoke.

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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 lap-winding ?

 PZL/4SP²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²

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