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What is OT in a transformer, specify its function.
ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. 
where we use zero sequence current transformer or core balancing ct.
Why the core of a underground cable is spiral in shape instead of straight??
what is the significance of 3.5 core cable? or what does this half core mean and why is it required?
what is the grounding Calculation formula? spouse i want to provide grounding to 3phase 18kw motor or i want to provide ground to 3phase 10kva dry type transformere or you give me any exemple...... Thanks.
1.What is captive power plant? 2.What is national grid?Give brief idea.
if you asked to choose a ckt breaker from MCB & MCCB for 32A which one will be best and why??
what will be the neutral to earth voltage while checking by the Digital multimete? and why?
What is meant by shunt current?
can we use IGBT as a AC-DC converting device in the applications?
WHaT IS THE CONCEPT OF INDUCTION LAMPS IN MODERN LIGHTINGS, and HOW IT WORKS TO EMIT LIGHT ( AS NO ELECTRODES ARE PRESENT ) ?" COULD INDUCTION LAMPS CAUSE INTERFERENCE WITH COMUNICATIONS INTO A STORE USING INDUCTION LIGHTING ? WHAT IS THE BENEFIT OF USING THE LOW FREQENCY INDUCTION LAMP , VERSUS LED , AND VERSUS FLUORESCENT, AND VERSUS ANOTHER KIND OF LIGHTING . THANK yOU MOISES GUINDI