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1. (a). what is the need for power factor correction?
(b). A 3phase synchronous. Motor is connected in parallel with a load of 500 KW, 0.8p.f lagging and its excitation is adjusted until it raises the total P.F to 0.9 lagging. If the mechanical load on the motor including loss takes 125KW, calculate the KVA input to the motor. Draw pharos diagram for condition.
2. i) What are the disadvantages of low power factor? How to avoid it?
ii) What are the measures relates to power quality?
A coil is placed in series with a resistance of 30 ohms. When the combination is connected to a 220 V, 60 Hz source, the current is 4.2 A and the power drawn by the circuit is 670 W.
a) Calculate the wind force on the turbine for a 5 mph wind. b) What is the force if the wind speed is tripled? c) Calculate the torque on the tower for the cases of the 5 and 15 mph wind velocities
A circular ring of charge of radius a lies in the x-y plane and iscentered at the origin. If the ring is in air and carries a uniform density ρl show that the electric potential at(0,0,z) is given by V = ρl a / [2ε0(a2+z2)1/2 ]
Consider putting down a metal electrode with a 4.50 eV work function on a piece of Ge which has an electron affinity of 4.00 eV, an intrinsic carrier concentration at 300K of 2.5 x 1013/cm3, and that is doped with 1.0 x 1016 donors/cm3.
Given a circuit description such that count the number of cars in the traffic junction.the traffic light red signal should always be on,but get off when green light is on.Green signal is on for time equal to the number of cars.For example,if 3 is ..
If I put a short in across the terminals a and b, does that mean the Isc = 0 since the capacitor would eventually charge and thus become an open circuit If so, how to do you find Vt and Rt
Design methodology (show calculations and provide rationale for design choices; remember that your choices must take into consideration commonly available parts). Final schematic in Multisim Components/Parts list Simulation results for your design Te..
Assume a Hertzian dipole antenna model. (a) Calculate the antenna radiation resistance and Ohmic resistance, (b) Calculate the radiation efficiency of this antenna, (c) Calculate the input impedance, (d) calculate the antenna gain
A 65 kVA load with a lagging power factor is combined with a 25 kVA synchronous motor load which operates at pf = 0.60 leading. Find the power factor of the 65 kVA load, if the overall power factor is 0.85 lagging.
A four-bit barrel shifter is a combinational circuit with four data inputs, two control inputs, and two data outputs. It allows the data inputs to be shifted onto the outputs by 0, 1, 2, or 3 bit positions, with the rightmost bits wrapping around ..
A charge q is placed between two grounded infinite parallel conducting planes which are a distance "d" apart (see figure attached). Let ε_r = 1.
An Internet service provider has three different subscription packages for its customers: Package A: For $9.95 per month 10 hours of access are provided. Additional hours are $2.00 per hour. Package B: For $14.95 per month 20 hours of access are pr..
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