Questions – Answers
Electrical and Electronics Engineering Interview Questions and Answers
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How Does Temperature Impact Sag in Overhead Lines?
Effects of Temperature on Sag in an Overhead Line The sag in an overhead line, which refers to the vertical distance between a conductor and the straight line between its…
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Why Avoid Plugging Space Heaters into Power Strips or Extensions?
Why Space Heaters Should Not Be Plugged into Power Strips or Extension Cords? It is a cold weather reminder that you should NOT plug space heaters into power strips or…
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Why is Power Transmitted at High Voltage Instead of High Current?
Why is High Voltage Used for Power Transmission and Not Lower Voltage? Transmitting electrical power at high voltage and low current is a more efficient and economical approach for long-distance…
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What is the Power Angle in a Power Transmission Line?
What Is the Power Angle in Transmission Lines, and How Do You Calculate It? The power angle (denoted by δ) is the phase angle difference between two voltage levels in…
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Why is the Ground Wire Always Positioned Above the Overhead Power Lines?
Why is the Ground Wire Above the Phase Lines in the Overhead Transmission Line? The ground wire (also known as earth wire or OPGW) above the phase lines in overhead…
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What is the Minimum Ground Clearance for Overhead Power Line?
Minimum Ground Clearance Standard of Sag Due to safety reasons, an adequate distance is always maintained between the overhead conductor and the ground, depending on the transmission or distribution voltage.…
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How Many Poles and Towers are Situated Within a 1-km Span?
How Many Utility Poles and Transmission Towers are Located Within a 1-kilometer Distance? The number of electricity poles for distribution and towers for power transmission in a 1-kilometer distance can…
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Why are Overhead Power Transmission Lines Not Insulated?
Why Use Bare Conductors for Overhead Transmission Lines Instead of Insulated Conductors? You may have noticed that we use insulated cables for underground power transmission, as well as in industrial…
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Why are “High Voltage” Signs used when Only Current Kills?
Why are ‘High Voltage’ Warning Signs Used When It’s Only Current that can Cause Electrocution? “High Voltage” warning signs are used to alert people to the presence of potentially dangerous…
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What Do the 5P10 and 5P20 Mean in a Current Transformer?
What Do the 5P20 and 5P10 Accuracy Classes Mean in Current Transformers? For a current transformer (CT), different accuracy classes, such as 5P10, 5P20, or 10P10, are chosen based on…
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