Answer Posted / vilas morti

voltage drop for 230v

what is the difference between earthing and unearth

2960

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pls tel me the electric train traction motors name plate details like rpm,torue,voltage,amps,watts..ect..

1996

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Could the power factor on electrical system can affect the registration of the kwhr meter or the CT/PT? 

1892

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1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

1962

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in an electronic tri vector meter when the current and voltage sequence changes ? what is the effect of phase sequence on recording of meter

2163

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How halogen & merquery lamp works.

2103

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i have attended the interview on 4th June,08 at Kolkata in IOCL, can anybody tell me what is its result

1922

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How isolater function when installed inelectrical 440V wiring

2164

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if sf6 gas low in gis what will happen

767

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For the requirement of a furnace of temperature range up to 1200 oC using silicon carbide rods, What is the required rate of transformer needed (please do it with all details)?

1893

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hi can any body send me syllabus of rrb electrical section engg... and past pepar also of any board...

2612

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how to select automotive wire by mathematical equation with given current, vlotage and resistance

2291

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what is the use of permanent magnet generator in exciter

2096

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Why Neutral Isolation is required?

2177

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why and where we use early make & late break contacts in protection?

8248

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