Hi all,
If we use long socket extension (comparable to the length of the breaker bar or ratchet) to tightening lug bolts on a car, are we creating greater frictional force underneath the bolt head and in the threads because of the torque that is created that wants to bend the bolt head (torque...
Hi,
I am trying to build small earthing electrode in very limited space for a house that doesn't have it. It will be used with RCD (deltaI 300mA or 100mA) in system with 240V. I am choosing between straight horizontal stripe (around 7 m long) and two horizontal stripes (3.5 m long) crossed at...
Hello,
Local drinking water supply company has problem with high pressure in the pipeline. Reservoir is located 100m above the valley so the pressure inside the pipeline at the bottom is 10 bar and it is supposed to be 4 bar. Average water flow through this main pipe is around 80 l/s. I am...
Hello,
I am analyzing one potential location for micro hydro power plant. Gross head will be between 4,1m and 4,5m. To achieve this head I need 73m long pipeline. It will be placed 1m below ground level in the soil near the river. I analyzed steel and GRP pipes and their prices, but I wonder is...
I have one beginner question.
If we connect small (micro) power plant (100kW) to the grid in the locality with thousand residents, how can we know if our small power plant will deliver all produced power to the grid? I mean, if in that locality at one moment is very low power demand how can we...
Hi!
I would be grateful if someone can explain how is voltage frequency controlled (kept constant) in the squirrel cage induction generator driven through the gearbox by the turbine connected directly to the grid. I read that generated voltage and frequency are controlled by the grid, but I...
When we start the engine on a cold day (below freezing point) there is condensed water vapor (mist) coming from the exhaust. When the engine and the exhaust get hot there is no more water vapor mist coming from the exhaust. Why? When moist hot gases exit the hot exhaust they enter very cold air...
If we compare two equal engines that use the same type of oil, is it possible that they use different amount of oil and still have the same fuel consumption and power generation? In other words, is engine that use less oil better engine?
Car manufacturers say that up to 1l per 600-1000 miles...
Hi!
Does lightning protection system on building increase the chances that this building will be hit by a lightning compared to this same building without lightning protection system? Some people say that it does and some that it doesn't. What is correct?
If this is not correct forum to post...
Hi!
Can someone explan why F1 engines break after only few hundred miles, I mean what parts are the weakest link and why do they fail? What is the most often reason they broke?
I read that some civil sport car engines (Audi R8 V10 for example) have average piston speed higher than F1 engine...
Hi!
In the attachment a posted picture with the schematic that I will talk about.
I wonder what will happen with the neutral line voltage at a transformer when large fault current starts to flow. For example if in someone's house hot line touches metal object that is conected to the ground...
