A three phase motor 20hp with a power factor of 0.85 is to be fed by four single-core, PVC insulated,
copper conductor, non-armoured cables, clipped direct on a non-metallic surface in a confined space
with ambient temperature of 45oC at 40 meter run as shown in Figure Q2. Determine the suitable size
of conductor if the voltage drop from the MCB to the motor terminal must less than...

I want to know that I have a structure about 100 meter height and I have to install lightening arrestor on the top and its earthing arrangement also. And structure is also to be earthed,
so can I connect both lightening arrestor earthing and structure earthing together? or it has to be done separately?

What are some advantages and disadvantages of a synchroscopes ?

What are the advantages and applications of bidirectional induction motor?

Can anyone derive the transfer function of Fractional order PID controller?

Explain How pinch off occurs in MOSFET?

What are the differences between modular and conventional UPS and its applications?

What is standard height of P, R & S towers used in 132KV transmission lines?

A capacitor, resistor and inductor are connected in series as well as in parallel also. Is energy storing in those three elements are same? Explain

I have acquired numerous individual speakers two sound bars and two sub-woofers and I am looking to make a surround sound for my home theater but not sure how to connect them all together.

How we can say that losses are frequency dependent? If there is no frequency than there is no losses? any have physical significant of this statement? Please provide me a better solution for my doubt

Why converter transformers are rated as 690V on secondary side and What is the specific reason for using 690Volts in converter transformers?

Why voltage is to be controlled?
why current is to be controlled ?

OFF-LINE UPS

Lower cost than other units
Under mains power unit charges batteries and power passes directly to the load
During mains failure batteries provide power to DC/AC inverter to provide 230VAC power to the load
Square-wave or Sine-wave output


ON-LINE UPS

Constant duty inverter
Design inherently improves power quality and...

while supply voltage 12V, when I adjust 17V to circuit,my virtaul ground potential become about 0.9V.Why this happening ? Is virtual circuit always zero potential ? Thanks for your helps.

Hello, I have two 12v DC wind generators that can provide charge to a 72v battery bank. This bank is used to power a 72Volt Electric Motor. I have one connected to the first battery (the positive connect for the entire bank) and the other generator is hooked up to the other or last battery of the 72v bank (the negative connect). Is this proper? Or, what do you recommend? Which manner should I best...

More or less what are the similarities and differences in paramagnetism and "Magnetic susceptibility".