Answer Posted / k.prakashchandra

yes

What is the difference between type1 and type2 relay protection co-ordination for motor feeders

2213

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In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

2078

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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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Operation of isolators.

1872

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What is the maximum breakdown voltage of 11KVA and 66 KVA power line and how it is calculated?

2272

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can u give me a brief idea about power line carrier communication ??

1960

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Why does amplifier gain reduce?

1038

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What is the effect of solar radiation on the design of an Isolated Phase Busduct?

2339

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Why do we need a separate control desk & PLC control panel in Boiler plant or coal handling plant? Can we provide cost effective Control desk cum PLC panel. Is there is an specific need for control desk.. kindly advice.

2349

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How stabilizer works??

2089

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How to know about the rating(voltage and other) of induction motor if its name plate is missing at the manufacturing site.

3361

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delta motor winding resistance I take normally single winding is 2.5, which value is came delta connection ie RY ?

1984

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What is a slack bus?

1124

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Benifits of 3ph 4 wire metering over 3ph 3 wire

2458

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What are factors to be considered while we selecting the Core Balance Current Transformer for Earth fault protection

1856

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