Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / shyams
It is the time required for the electric motor to attain 63.2% of the maximum temperature reached by that electric motor
| Is This Answer Correct ? | 15 Yes | 0 No |
Post New Answer View All Answers
What are the advantage of free wheeling diode in a full wave rectifier?
State The Difference Between Generator And Alternator?
what is the reactance,capacitance & impedence electrical armoured & unarmored Cables.
what is the principle of operation of CFL ??
Sate maximum power transfer theorem?
The synchronous machine excitation system explain
how to define tell me about self
What is the actual calculation for transformer short circuit test?.
i am trying to PSUs/govermeant jobs since last 2 years but still i m not success, plz help me.
tell me about eletrical contractor
What is the power factor of an alternator at no load?
How to calculate Voltage regulation of 22 KV Over head Line.
in control scheme dc logic wiring commonly using negative loop,what is the reason?if we use positive looping what will happen?
how can i apilly for electrical c licencese.sir,i completed B.Tech in electrical & electronics engineering in 201onot working any company
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.
