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Application: Ground resistance of electrodes. A ground electrode is built in the form of a hemisphere, of radius a = 0.1 m, buried in the ground, flush with the surface as shown in Figure 7.39. Calculate the contact resistance (resistance between the wire and surrounding ground). You may assume the ground is a uniform medium infinite in extent, with conductivity σ= 0.1 S/m. Hint. Calculate the resistance between the hemisphere and a concentric conducting surface at infinity. Note. This is an important calculation in design of lightning and power fault protection systems.
Limestone (calcium carbonate) particles are stored in 50-L bags. The void fraction of the particulate matter is 0.30 (liter of void space per liter of total volume) and the
A 100-kW, 250-V shunt generator has an armature-circuit resistance of 0.05 Ω and a field circuit resistance of 60 Ω. With the generator operating at rated voltage,
Explain the effect of insulating a hot surface - What is meant by the economic thickness of lagging and determine the convective heat transfer coefficient -Describe what is wr
If the slip-ring voltage is 400 V, when the rotor frequency is 120 Hz, at what speed must the rotor be driven in order to give 150 Hz at the slip-ring terminals? What will t
The heat capacity of thereactants and products are 1.95 kJ/kg-K, the volumetric flow rate is 0.33 m3/hr, and the feedtemperature is 20oC. If the conversion is 95%, calculate
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A condenser is required to condense n-propanol vapour leaving the top of adistillation column. The n-propanol is essentially pure, and is a saturated vapourat a pressure of
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