Tutor profile: Sanket M.
Subject: Electrical Engineering
What is meant by knee point voltage?
Knee point voltage is calculated for electrical Current transformers and is very important factor to choose a CT. It is the voltage at which a CT gets saturated.(CT-current transformer).
If you choose an answer to this question at random, what are the chances that you'll be correct ? a) 25% b) 60% c) 0% d) 33%
Read the question again – it never implies the answer is one of the multiple choice options, if you rephrase it then it’s more understandable. Picture there being 3 light bulbs and 4 doors. 2 doors lead to the light bulb on the left, and the other 2 doors lead to 1 of the light bulbs each. If the bulbs light up randomly, what’s the probability of walking through a door into a lit up room? If the left one lights up you’ll be right 50% of the time, if the middle one is on then 25% of the time, and if its the right one then 25% of the time as well. Each of these light bulbs randomly will light up 33% of the time, therefore – [33% * 50%] + [33% * 25%] + [33% * 25%] = Probability of being right = 33% And there we go, the answer to this question is 33%.
What is the Sound Barrier?
Once thought to be an impossible speed, Chuck Yeager broke the sound barrier with the Bell X-1 rocket plant in 1947. As an object moves through the air, it pushes nearby air molecules causing a domino-effect on surrounding molecules. This causes a pressure wave that can be interpreted as 'sound.' As a plane approaches the speed of sound, its pressure waves stack up ahead of it to form a massive area of pressurized air that we call a shock wave. These shock waves are heard as sonic booms. The sound barrier is broken by any vehicle exceeding the speed of sound: 660mph.
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