Environmental Engineering Interview Questions and Answers: 1. Define Environment. Ans. The physical, chemical and biological presence of living and non-living things outside an individual species is called as its environment. 2. Define the term Environment…
Coal Burner Working Principle: The coal burners are employed to fire the pulverised coal along with primary air into the furnace. The secondary air is admitted separately below the burner, around the burner or elsewhere…
Hydrological Cycle or Rain Evaporation Cycle: Hydrological Cycle or Rain Evaporation Cycle is a process by which moisture from the surface of water bodies covering the earth's surface transferred to the land and back to…
Series Capacitor - Working Principle, Phasor diaagram, Application: In EHV and UHV transmission lines, series capacitor are connected in series with the line to reduce the effect of inductive reactance XL between the sending end…
Servo Type Voltage Regulator Working Principle: The main features of a servo type voltage regulator using an amplidyne is depicted in Fig. 19.8. The servo type voltage regulator system comprises of a constant voltage main…
AC Excitation System - Block diagram and Working Principle: This AC Excitation system consists of an alternator and thyristor rectifier bridge directly connected to the main alternator shaft. The main exciter may either be self…
DC Excitation System Working Principle: In dc excitation system, the system has two exciters—the main exciter (a separately excited dc generator providing the field current to the alternator) and a pilot exciter (a compound wound…
What is Harmonic Suppressor? Harmonic suppressor is an iron-cored reactor and is used in the neutral ground connection of a generator so that third harmonic currents are reduced to safe value. If the third harmonics…
Metal Oxide Lightning Arrester: Metal oxide lightning arrester belongs to the new generation of station metal oxide surge arresters developed by General Electric Co. in 1976. This is useful for the protection of systems rated…
Oxide Film Lightning Arrester: Oxide film lightning arrester operates on the fact that certain dry chemicals have the property to change rapidly from a good conductor to almost perfect insulator when slightly heated. For example,…
