Answer Posted / jojo

Stray loss is caused by leakage magnetic flux that induce eddy current and hysteresis loss in nearby metallic structures. This is distinctive from core loss or sometimes called iron loss which is eddy current and hysteresis loss induced by the linkage magnetic flux in the stator iron core itself.

What is the current carrying capacity of 0SWG,3SWG,10 & 12 SWG solid bare overhead copper conductors?

3452

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while doing high voltage test on 11kv/433 distribution transformer why we only give 28 kv on hv side and 3kv on lv side for power transformers what is the value what factors it depends

2863

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State and define ohm’s law?

1158

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what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load

4029

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As we use capacitor bank in 3ph ckt to improve PF, can we use capacitor in single ph domestric use, in house we have Fan,Mixer,electric cooker,iron,tube choke they also lag the system,because it is inductive load. if it is possible to improve PF of single ph system-- if yes- type of capacitor to be used,connection diagram, working in detail. if no-- list it.

1782

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how many parameters can integrate with fire alarm basically ?

1973

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Starting Time of LT & HT Motor

1959

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What is inrush current? how can calculateit? what is the affect of it?

2072

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What is meant by positive and negative feedback?

1054

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Difference between field rheostat and armature rheostat.

1237

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can i use 2000/5A Clamp meter to measure HT cable

2029

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How to setting the volume of RTCC panel AVR (11kv) controller

1597

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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.

2043

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In a large office how do we calculate required number of light fittings, assuming fittings are 4x18W or 2x36W fluorescent fitting ?

1883

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what is quality factor in series resonance circuit and calculate the factor of voltage magnification? how it happens?

1979

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