Answer Posted / k.prakashchandra

To absorb the heat

what is meant by impulse voltage?

1992

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Explain the function and difference of Restricted earth fault, simple earth fault and sensitive earth fault with connection diagram.

2639

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What is the difference between rulling span and wind span of of an Over Head Transmission Line?

2311

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I am doing apprenticeship training at HT switch yard in NLC. How can i get electrical c license. ??? What r the rules for getting it as an apprentice? ??

1828

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Write down the brushes of a de machine.

1880

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can anybody sent me power grid questions. what subject should i prefer for preparation?

2102

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What are n circles?

1073

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draw vector diagram and +ve,zero sequence diagram of symmetrical three phase fault.

2018

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Define filter?

1099

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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.

2016

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what is meant by loss of field in a DC motor? how a universal motor works?

1836

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how braking & making capacity of circuit breaker is calculated?

1988

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main difference between ac and dc?

1689

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what is the benefit of floating our DC source? if i have two floating DC source of which 1 has a ref voltage of -21VDC and the other of -18VDC. can it be connected in parallel to share a common ref voltage? if not, how do i make both sources to be of common ref voltage? tks

1880

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What is meant by RVT and NDR ? expansion and details of it

3016

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