Technical articles on Electronics and Electrical Engineering topics focused on Basics of EE, Electronic components, power systems and equipment used for generation, transmission, operation, and controls of electricity.
The range within which an electrical protection device can detect a fault is termed as the device’s zone of protection. A short circuit fault occurs when a phase is connected to another phase or to ground via a low-impedance path. A short circuit results in the production of very high current magnitudes that can cause … Read more
The term Headworks is used in civil engineering for any structure at the head or diversion point of a waterway. Generally, it is smaller than a barrage and is used to divert water from a river into a canal or from a large canal into a smaller canal. In the case of hydroelectric power plants, … Read more
The hydroelectric power plant reservoir is the enlarged lake behind the dam structure and is responsible for the storage of water. During the course of heavy rainfalls, the water flow exceeds the storage capacity of the reservoir. In order to avoid a dam against damages, surplus water should be discharged. A structure called spillways is … Read more
Electrical Engineering MCQ on Diodes The leakage current in a crystal diode is due to which of following Correct answer: 3. Minority Carriers
A transformer helps move electricity from one location to another. During its working, a transformer may vibrate or shake a little, and that tiny movement can cause a humming noise. The buzzing sound commonly heard from transformers or fluorescent light ballasts is caused by a phenomenon known as magnetostriction. This effect is a result of … Read more
The exciter is an electrical device that supplies direct current to the field winding of the generator, at the required voltage level to overcome the resistance of the winding. The term exciter is very often used in the field of electrical machines and power generation. An exciter is usually a small generator that supplies the … Read more
Electrical Engineering MCQ on Transformer No-load current in a transformer No-load current in a transformer Correct answer: 2. Lags behind the voltage by about 75° The winding of the transformer that has less cross-sectional area The winding of the transformer that has less cross-sectional area Correct answer: 1. High voltage winding During open circuit test of a … Read more
A condenser is an important device in steam power plant. It is responsible for condensing the steam that exits the turbine. It plays two vital roles. It generates a substantially low pressure at the turbine’s exhaust that inturn allows for the steam in the primary mover to expand to an exceedingly low pressure. This process … Read more
The air preheater is an auxiliary component of steam generating power plant. Recuperative and regenerative preheaters are two types of heat exchangers used in steam power plants to recover heat and increase the efficiency of the thermal power station. The major difference between these two types of preheaters lies in the way they store and … Read more
When two conductors that are having a large spacing as compared to their diameters are subjected to an alternating potential difference, the atmospheric air surrounding the wires remains unchanged till a certain specific value of voltage. However, if the voltage surpasses this specific value a faint violet glow called corona appears around the conductors. This … Read more