Answer Posted / raghavendra m.
Contactors are electrically control switch used to switching electrical circuit.
Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
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.
What are the basic elements used for modeling mechanical translational system?
What is DC series motor?
If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these
All tape of electrical questions Answers tape of motor transformer e.o.t crane
In between UPS out going changer over switch and ups raising main input, both side cable gland producing heat but the cable doesn't get heat,Why?
What is your acheivements
what is difference between 9kv 5ka surge arrester and 9kv 10ka surge arrester.
State kirchoff voltage law?
what is invertor supply and raw powersupply
distribution is maximum done by a)radial b)network c) parallel d)b & c
What is the difference between amorphous core transformer and CRGO core transformer?.
why surge protectetor work explain with the help of circut diagram?
As i want some model question paper in basic computer science and history please send me immediately sir
Discribe type of fault in DOL and stardelta startor.