Answer / shahadat

PLL is Phase Locked Lood.

It is a control system that generates an output signal whose phase is related to the phase of an input signal.

For details; search in wikipedia.

Can we use Motor protection CB while we use the VFD for Speed control?? if not means please tell the reason!!!

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What is bandpass of a transformer?

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I've descovered that when the earth wire in a domestic electrical installation is not connected back to the board (ground) a voltage of between 9-24v is is found to be present in the earth wire. When connected at the board there is no voltage - is this normal and why does it happen?

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WHY CAN WE NOT CHAGE SPEED OF SYNCHRONOUS MOTOR...............................JUSTIFY

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how harmonics are generated due to nonlinear load & how harmonic filters work?

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what is active network?

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what is laser diodes?

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it is possible to measurement of tension of slipring induction motor(SRIM)carbon brushes, any maesuring instruments are available in the markets.

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