Your email address will not be published. All rights reserved. Also, over a period, they tend to leach away from the vicinity of the electrode. In an ideal case, cross-section and physical composition of the examined material are uniform across the sample, and the electric field and current density are both parallel and constant everywhere. Reference: Practical Grounding, Bonding, Shielding and Surge Protection G. Vijayaraghavan, Mark Brown and Malcolm Barnes (Buy hardcopy from Amazon). The resistivity of semi-conductors lies between that of conductors and insulators. Moisture is an essential requirement for good soil conductivity. Factors affecting resistivity. copper is lower than that of manganin. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. (See the adjacent diagram.)
Explain ... Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day. Loose soil is more resistive in comparison to compacted soil. Moisture content of the soil can vary with the season and it is advisable for this reason to locate the electrodes at a depth at which moisture will be present throughout the year so that soil resistivity does not vary too much during the annual weather cycle. Multiple choice questions here are on topics such as Electrical Machines, Power Electronics, Electrical measurement & units, Utilization of Electrical Energy, Basic Electrical Engineering, Electrical Installation, Power Systems, Testing & maintenance of electrical equipment's etc.
Brother jese ap ne Pak study aur general knowledge ka quiz rakha hai aese hi Electrical engineering ka b Quiz bna den. Resistivity The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. A, I is directly proportional to V,then V is also proportional to l (is it true). Required fields are marked *. Moreover, these additive salts have to first get dissolved in the moisture present in the soil in order to lower the resistivity, and provision should be made for addition of water to the soil surrounding the electrode to accelerate this process particularly in dry locations. Your email address will not be published. The IEEE 142 gives several useful tables, which enable us to determine the soil resistivity for commonly encountered soils under various conditions which can serve as a guideline for designers of grounding systems. Electrodes use these principles to dramatically lower the resistance of individual electrodes under extreme soil conditions. Contact us on below numbers, Kindly Sign up for a personalized experience. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. SI Units: Resistance: 'Ohm' or Ω. Resistivity: 'Ohm - meter' or Ω-m What are the 4 factors that affect […]
C. type of material. Though the ground itself being a very large body can act as an infinite sink for currents flowing into it and can be considered to be having very low resistance to current flow, the resistance of soil layers immediately adjacent to the electrode can be considerable. The resistivity of the conductor depends on, ELECTRICAL ENGINEERING MCQS AND QUIZ TEST FOR PREPARATION. Chlorides, nitrates and sulfates of sodium, potassium, magnesium or calcium are generally used as soil additives.
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