DCM 08B Losses and Efficiency of DC Machines

[@NashimMdArafatSaikat]

I am from Bangladesh and I love your teaching ...thank you sir

[@bharathsai533]

sir at 14:56 to get denominator less why we did differntiation sir, why we should not decrease current or voltage?

[@MikeJohnMentzer]

Thank You So Much Sir🙏

[@surendrakverma555]

Very good lecture Sir. Thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@a_10_bhutariteshmanish48]

In numerical brush drop per brush was considered or not because it was not multiplies by 2 for 2 brush

[@NashimMdArafatSaikat]

Sir, you have said that brush loss is counted with armature cu loss but you have also included brush loss in friction loss, why is that?

[@raghudharmana8732]

Sir, generally there will be 2 brushes but we have considered only one brush drop in numerical.. I think we should consider both brushes drops.. can u clear my doubt pls

[@sravnichappa2747]

Multiply with 2 to get total brush drop

[@ahmedhamdybjr6462]

Great Videos Indeed, but my question is :
Sir you mentioned that max efficiency of shunt machine is 50% then in the example we got around 94% ?

[@ahmedhamdybjr6462]

@@lecturesinelectricaleng in the previous lecture "Types of DC Machines" the max efficiency of shunt dc motor was 50% and in this lecture the max efficiency of shunt generator more than 90%
,, Efficiency of shunt machine varies according to that machine whether it is generator or it is motor?

[@nirujaghimire6685]

@@ahmedhamdybjr6462 no he showed in maximum power condition the efficiency will be 50% so we don't use maxm. power condition.

[@VarunKumar-eh6xc]

The maximum efficiency of a d.c. motor occurs is 3/4th full-load. The constant losses are 900 watts. Then the full-load copper losses are:
1) 1200 watts 3) 1800 watts 2) 1600 watts 4) 2000 watts
Answer please 🥺🥺

[@farhanrahat4988]

Nice explanation sir

[@MANOJKUMAR-mb2uw]

Sir is constant losses and stray load losses are same

[@MANOJKUMAR-mb2uw]

Thank you sir

[@selvakumar-wo6gb]

Thank you sir

[@Arijit_VU3ICT]

Thanks sir...I have a quary

[@Arijit_VU3ICT]

@@lecturesinelectricaleng sir plz suggest me a good book on high voltage engineering as I am working on EHV substation. Thank you..

[@sanjurani4898]

「目標を指定してお金が必要」、

[@nihaljhariya6910]

first Improve your handwritting sir then teach...👍

[@saltydino1297]

it doesn't matter how good or bad the writing is, as long as you're willing to learned and on how he delivered his point in a right way is not a problem to the watchers.

[@Metheunknown917]

First you improve your handwritting 😂

[@kesavanp1926]

Thank you sir