Answer / zan

yes i agreed..

A flyback diode( sometimes called free wheelingdiode)
reduce harmonics and also it reduce the voltage spike seen
occure in an inductive load.

Answer / durga05

A Free Wheel Diode (FWD) at the output of a full wave rectifier will:




1) Increase DC voltage for a given firing angle due to the elimination of negative portions of the instantaneous dc waveform in a SCR phase controlled converter,




2) Will reduce the generated ripple voltage on the DC side of a SCR phase controlled converter due to same reason as in above, reducing the filtering requirements.




3) Will improve the input PF in an SCR phase controlled converter due to ending the input current waveform earlier by permitting internal free-wheeling.




However, the above will happen only if (a) the DC side has sufficient inductance either as filter or as part of load, (b) the firing angle is more than 30 deg for 3-phase, only after which the negative portion appears. Note that there will be no benefit in a diode rectifier since the FWD is always reverse-biased.




Also note that use of the FWD prevents operation of the SCR converter in inversion mode.

Answer / shubham

along with harmonic reduction, it also reduces sparking and
arcing across the mechanical switch (if being employed)

Answer / guest

Supplies the voltage at negative vlotage

How you take care of a motor from over loading and what are the different overloading ratings of different motors?

4 Answers  

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54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?

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Why corona takes place?

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What is Earthing?

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