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.
In order for a BJT to operate as an amplifier, the base-emitter junction must be forward-biased and the base-collector junction must be reverse-biased. This is called forward-reverse bias. Also: BJT MCQ Quiz The three currents in the BJT transistor are the base current (IB), emitter current (IE), and collector current (IC). The correct mathematical relationship … Read more
This type of tariff is identical to two-part tariff with the difference that a separate meter is installed in the consumer’s workplace for measuring maximum demand. The maximum demand tariff is generally recommended for big consumers. Power factor is defined as ratio of true to apparent power. Also see here Power factor correction See MCQs … Read more
Sliding Scale Tariff is also known as Average Power Factor Tariff. In this type of tariff, an average power factor is set as a reference power factor. If a consumer has his power factor below this reference point, additional charges are made. However, if power factor of consumer is above this reference, he is provided … Read more
Arc in circuit breakers can be extinguished using two methods. These are High resistance and Low resistance methods. In the high resistance method, arc resistance is made to increase with time. Since current and resistance are inversely related, as a result, current is reduced to a value that is insufficient to maintain the arc. The … Read more
Underground Electrical cables can be classified in two ways. The first type of classification is based on insulating material used in their manufacturing, while the second type is based on the voltage for which they are manufactured. The first classification of classification is not quite popular and is only applicable when specific applications of usage … Read more
A superheater is the equipment of a steam power station that superheats the steam. The superheater is responsible for raising the temperature of steam above the boiling point of water. It is used to increase the overall efficiency of the plant. Also see: Efficiency of Steam Power Plant The basic construction of a superheater involves … Read more
The steam power plant is a generating station that converts heat energy of coal combustion into electrical energy. Given below are a few disadvantages of the steam power plants. See also: Top 5 advantages of Steam Power Station
Stringing charts are widely used in the field of Electrical Power Engineering for stringing conductors. In such charts, temperature-sag and temperature tension charts are plotted for the given conductor and loading conditions. These charts are very helpful and find their application while stringing overhead lines. The figure below shows a stringing chart:
The modern-day transmission line conductors are steel cored aluminum conductors that are abbreviated as ACSR. Given below is an overview of aluminum as material. Aluminum is cheap and light material as compared to copper however it has much smaller conductivity and tensile strength. Conductivity: As compared to copper, the conductivity of Aluminum is 60%. The … Read more
The Solid system of Laying Underground Cables involves laying of cable in open pipes or troughs dug out in earth along the cable route. The troughing employed for solid laying is generally of cast iron, stoneware, asphalt or treated wood. Once the cable is laid in position, the troughing is filled using a bituminous or … Read more