Questions :-
HR-
Q.1 about yourself & family background ?
Q.2 Why u choose Power sector as ur carrier starting not any
other sector ??
Q. 3 What think abt NTPC ?
Techincal Questions:-
Q.1 about Vocational Training……What u did , see the main
equipments….etc
Q.2 Why a transformer Noise during its running condition ?
Q.3 about transformer oil material & Test name for the
measurement of its dielectric strength & wht will u do if
its dielectric strength goes low ? ……..some discussion type ?
Q.4 What is relation between transmission lines &
Communication lines ?
Q.5 Which Machine u will prefer to use at a place where
flammable gases are coming out & why ?
Q.6 how fault in an electric system is detected & hw
protection of equipments is done ?
Q.7 Why we didn’t feel electric shock in an electric train ??
Q.8 Anything u want to ask from us ??
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Answer Posted / kanhaiya sharma
please send the answer my email id .........
kanhaiyasharma09@gmail.com
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what is meant by residual over voltage & residual earth fault ?
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 0for 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.
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