1. A 69-kV (L-L), three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 + j0.4375 N per km. We want to evaluate the transmission line efficiency when the line delivers 70 MVA, 0.8 lagging power factor at 64 kV. Determine: (a) which is L-N) the sending end voltage, (Note that -the voltage should be expressed as per phase value, (b) the sending end current (c) the voltage regulation

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.