what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors

1493

is it value of power factor is more than unit. whats effects in the source supply

1586

What is the effect of positive feedback on the stability of the systems?

628

What is super thermal power plant? and how it will differ from normal thermal power plant

1825

which types of relay used in acb and vcb?

2306

11 kg trivevter meter has rating of -/5amps. And pt ratio11000/110v and is connected with 11kv ct/pt unit of cr ratio 75/5amps. And pt ratio of 11000/110v while checking accuracy of meter with HT Accuchek meter what value of PT ratio and CT ratio to be filled in Accuchek meter

1182

please tell me when we start motor without load in star or delta connection whose current above condition,pl write formula

1779

How to calculate approximate load loss of a distribution transformer by knowing %ge imp of transformer?

1733

what is the difference between surge protection capacitor and surge arrestor

1805

what is v/f control in VFD?

1054

What is resonant frequency?

691

In parallel operation time both NGR’s close or not close if both close what will happen

3266

How to select, design,size & calculate for 11 KV/33KV/66KV/132KV/220 KV/440 KV circuit breaker for HT side of transformer protection/HT distribution protection?

2276

how to select the automotive wire size by mathematical calculation. for xenon headlamp with ballast. the ballast given data voltage 10-17v,current permenant 6amp, run up phase is 15amp, peak at swicth on max 400micro sec is 40amp.the sum of cable resistance is 150mohm.please provide referenc document if any for relating the peak at switch on current,time & wire wire size

1886

what is transformor oil gread

1952