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A synchronous motor on load draw a current at a leading power factor angle ϕ. If the internal power factor angle which is the phase angle between the excitation emf and the current in the time phasor diagram is ψ. Then the air gap excitation mmf lags the armature mmf by
The uniform GST rate on MMF(man-made fibre) products 12% recently announced by the Finance Ministry. What was the previous GST rate on MMF product?
A balanced 3 – phase induction motor runs at slip s. If ωs is its synchronous speed, what is the relative speed between the stator mmf and rotor mmf ?
How should the field mmf be with respect to armature mmf to reduce the armature reaction?
What should be the range of the field mmf to armature mmf ratio at full load?
What is the relation between rotor mmf and stator mmf?
What is the amplitude of rotating MMF produced as a result of m-phase currents flowing in m-phase windings? (where Fm is maximum MMF in any one phase, when current is maximum in that phase.)
If F1 is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3….), the harmonic MMF wave is of _____________
If F1 is the constant amplitude of fundamental rotating MMF wave, the for the space harmonics of order 6K-1 (where K=1,2,3….), the harmonic MMF wave is of _____________
In a single phase induction regulator, the voltage boost is maximum when armature mmf and rotor mmf make an angle of ____________