EXAMIANS
What is the function of inter pole in DC generator?
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The magnetic field which initially induces emf in the armature in a self excited DC generator is because of
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A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be
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In a transformer zero voltage regulation is achieved at a load power factor which is
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In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch
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In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when
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The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be
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φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
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In circle diagram for induction motor, diameter of circle represents which of the following ?
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Armature reaction depends on which of the following?
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