What is listactivity?
What is alias mechanism?
What is system r?
Does c++ cost money?
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.
How do you reference the fixed block file formats from cobol programs
How to replace last 4 digits of an input column with XXXX given input column has 12 digits?
How to expose an apex class as a rest webservice in salesforce?
What is the difference between range & x range ?
Describe the principles of design. .
What are table edits?
what is composition for cast iron as per is 120 grade 25
What are the differences between malloc() and calloc()?
What is the difference between User Settings and Application Settings in WPF?
Which method is used to enforce garbage collection in .net?