Starting and Speed Control of Single Phase AC Series Motor: The starting and speed control of single phase AC series motor is carried out by varying the applied voltage. As…

Automatic Block Signalling System in Railways: The purpose of automatic block signalling system in railways is to keep trains apart but permit spacing as close as safety permits. For optimum…

Current Collection System in Electric Traction and Types of Current Collection: There are mainly two systems of current collection system for loco­motives, tramways or trolley buses viz Conductor rail system…

Power Sources for Welding Process: Both dc and ac are used for electric arc welding, each having its particular applications; in some cases either is suitable. The electric properties of…

Ultrasonic Welding Working Principle and Applications: Ultrasonic welding is a solid state welding process that produces coalescence of materials by the local application of high-frequency (20-60 kHz) vibratory energy as…

Butt Welding - Definition, Types, Advantages, Disadvantages and Applications: Welding of two pieces of metal together with a butt weld can be carried out by different resistance welding processes. The…

Heating of Buildings - Factors and Types: The purpose of most forms of space-heating installation is to provide comfortable conditions in which people can work or relax. Space heating of…