Knowledge in ELECTRICAL ENGINEERING
UTILISATION OF ELECTRICAL ENERGY 2
Electric Heating 2.1 INTRODUCTION Heat plays a major role in everyday life. All heating requirements in domestic purposes such as cooking, room heater, immersion water heaters, and electric toasters and also in industrial purposes such as welding, melting of metals, tempering, hardening, and drying can be met easily by electric heating, over the other forms of conventional heating. Heat and electricity are interchangeable. Heat also can be produced by passing the current through material to be heated. This is called electric heating; there are various methods of heating a material but electric heating is considered far superior compared to the heat produced by coal, oil, and natural gas. ADVANTAGES OF ELECTRIC HEATING The various advantages of electric heating over other the types of heating are: (i) Economical Electric heating equipment is cheaper; they do not require much skilled persons; therefore, maintenance cost is less. (ii) Cleanliness Since dust and ash are completely eliminated in the electric heating, it keeps surroundings cleanly. (iii) Pollution free As there are no flue gases in the electric heating, atmosphere around is pollution free; no need of providing space for their exit. (iv) Ease of control In this heating, temperature can be controlled and regulated accurately either manually or automatically. (v) Uniform heating With electric
anvesh amilisetty
UTILISATION OF ELECTRICAL ENERGY 3
Electric Welding INTRODUCTION Welding is the process of joining two pieces of metal or non-metal together by heating them to their melting point. Filler metal may or may not be used to join two pieces. The physical and mechanical properties of a material to be welded such as melting temperature, density, thermal conductivity, and tensile strength take an important role in welding. Depending upon how the heat applied is created; we get different types of welding such as thermal welding, gas welding, and electric welding. Here in this chapter, we will discuss only about the electric welding and some introduction to other modern welding techniques. Welding is nowadays extensively used in automobile industry, pipe-line fabrication in thermal power plants, machine repair work, machine frames, etc. ADVANTAGES AND DISADVANTAGES OF WELDING Some of the advantages of welding are: o Welding is the most economical method to permanently join two metal parts. o It provides design flexibility. o Welding equipment is not so costly. o It joins all the commercial metals. o Both similar and dissimilar metals can be joined by welding. o Portable welding equipment are available. Some of the disadvantages of welding are: o Welding gives out harmful radiations and fumes. o Welding needs internal inspection. o If welding is not done carefully, it may result in the distortion of workpiece. o Skilled welding is necessary to produce good welding. ELECTRIC WELDING
TYPES OF DC DRIVE
Obtain the speed-torque characteristics of separately excited DC motor operated with 1-phase full converter and describe the effect of firing angle
Basic electrical engineering
Electricity is the flow of electrons from one place to another. Electrons can flow through any material, but does so more easily in some than in others. Semi-conductors: electron can be made to flow under certain circumstances. These are the exam papers of Basic electrical engineering.
PRAVIN SURYAWANSHI
Electromagnetic Field Theory Assignment
This is a 4th semester assignment of EMFT. It includes Wave equations, Maxwell's equations with numericals
Pranav Sundriyal
Electrical Machines Assignment
This is an assignment for Electrical machines for 4th semester engineering. It includes synchronous motors operations and numericals.
Electrical Machines Assignment (motor operations)
This is an assignment of 4th semester Electrical Machines. It has a vide variety of questions and explanations. It has got motor operations and numericals.
Single phase induction motors
This is an assignment of Electrical machine for students of 4th semester. It include questions from single phase induction motors with diagrams. Numericals and theory questions are also there.
Electrical and Electronics Measuring Instruments Assignment
This assignment includes questions on the subject Electrical and electronics Measuring Instruments (EEMI) for engineering students. It includes questions on voltmeter, ammeter and other measuring instruments.
Transmission, conductivity, resistivity
This assignment is for engineering students on the subject Power Systems. It covers a wide range of topics such as transmission, conductivity, resistivity etc. Numericals and theory questions are also there.
Power Systems Assignment(insulators, dielectric)
This is an assignment for the subject Power Systems for engineering students. It has a wide range of questions from topics like insulators, dielectric etc. Numerical and theory questions both are there.
Power Systems Assignment(transmission, power flow)
This is an assignment on the the subject Power Systems for third year engineering students. It includes questions from topics such as transmission and power flow. Numericals and theory questions both are available.