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A 120 V, 60Hz source is connected to a distribution line whose resistance and inductive reactance is .001 Ohm and j0.002 Ohm respectively. A single phase, 100 HP, 120V, 0.85pf motor and a 100 kW, 120 V Heater are connected in parallel. Find:
*The value of a capacitor connected in parallel to improve the pf to unity (pf=1)
*Current flowing in each olad before connecting the capacitor and after connecting it.
*Total impedance of the circuit before connecting the capacitor and after.
*power factor of the source before connecting the capacitor and after connecting it.
*power consumed by the load before connecting the capacitor and after connecting it.
* line losses before connecting the capacitor and after connecting the capacitor.
A new semiconductor has Nc = 1019 /cm3 and Nv=5 x 1018, and Eg = 2eV. If it is doped with 1017 donors (fully ionized), calculate the electron, hole, and intrinsic carrier concentrations at 627K.
a load consisting of induction motor is draming 80 kw from a 220 v ,60 hz power line of 0.72 lagging .find the capacitance of a capacitor required to raise the pf to 0.92
Calculate the value of the thermal voltage, VT at -400C, 00C, +400C and +1500 C. At what temperature is VT exactly 25mV
A three-phase load is Y-connected. The load has a phase voltage of 139 V and a phase current of 49 A. Each phase of the load consumes 5.1 kW of power. (A) Sketch and label the load. Find (b) the line voltage, (c) the line current, and
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.
Titan has numerous hydrocarbon lakes containing a mix of methane and ethane in unknown proportions. A small submersible vehicle will exlpore Kraken Mare, the largest lake.
Calculate the carrier concentrations and the type of semiconductor if a pure silicon crystal at 300K is doped with 2.5×10^13 cm-3 boron atoms.
A positive charge of 625 nC is uniformly distributed around a circular ring of radius 3 m that is positioned in the x-y plane. The center of the circle is at the origin. The relative permittivity of the medium is Epsilon_r = 1.
The voltage and current at the terminals of the circuit element in Fig 1.5 are zero for t
Semiconductor A is direct band gap and semiconductor B is indirect gap. For providing same short circuit current density of a solar cell, which material will need more thickness
Consider the convolutional code described by connection polynomials
For a certain source-free parallel RLC circuit, R=1k-ohm, C=3uF and L is such that the circuit response is overdamped. Write an equation for the voltage across the resistor if it is known that v(0-) = 9V and dv/dt|t=0+= 2 V/s
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