Powell Laboratories Interview Questions and Answers

Electrodes differ in their composition, shape, and purpose.

• Electrodes can be made of different materials such as tungsten, graphite, and copper.

• They can have different shapes such as cylindrical, conical, and spherical.

• Electrodes are used for different purposes such as welding, cutting, and electrochemical machining.

There are various types of welding techniques used in the industry.

• Arc welding: Uses an electric arc to create heat and join metals.

• Gas welding: Involves the use of a fuel gas and oxygen to create a flame for welding.

• MIG welding: Uses a wire electrode and a shielding gas to join metals.

• TIG welding: Utilizes a tungsten electrode and a shielding gas for precise and high-quality welds.

• Spot welding: Joins metal sheets by applying pressure and heat at specific points.

• Resistance we...read more

Boilers produce two types of steam: saturated and superheated.

• Saturated steam is produced when water is heated to its boiling point and vaporizes with no further increase in temperature.

• Superheated steam is produced when saturated steam is heated above its boiling point, resulting in a higher temperature and energy content.

• Saturated steam is commonly used for heating and power generation, while superheated steam is used in industrial processes such as turbines and engines.

• Boi...read more

Welding electrodes are used in fabrication to join two metal pieces together.

• Welding electrodes come in different types and sizes depending on the metal being welded and the welding technique used.

• Some common types of welding electrodes include stick electrodes, MIG electrodes, and TIG electrodes.

• The choice of welding electrode also depends on the thickness of the metal being welded and the welding position.

• Proper storage and handling of welding electrodes is important to pre...read more

Boilers are classified into fire-tube and water-tube types. Steam is generated by heating water in the boiler.

• Fire-tube boilers have hot gases from combustion passing through tubes which are surrounded by water.

• Water-tube boilers have water flowing through tubes which are heated by hot gases from combustion.

• Steam is generated when water is heated in the boiler and the resulting steam is used for various applications such as power generation, heating, and industrial processes.