Define fuels. Ans. Fuels defined as “a combustible substance containing carbon as the main constituent, which on proper burning liberates large amount of heat, which can be used economically for domestic as well as industrial...
Category - Question & Answers
1.What are the raw materials for cement? Ans: Calcarious materials – limestone,chalk etc. Argllacious materials – clay, shale etc. Powedered coal Gypsum. 2. What is the highest temperature maintained in the rotary...
1.Define abrasives? How they are classified Ans: Abrasives are hard substances used for grinding, cutting sharpening, polishing and buffing operations. They are characterised by high hardness, high melting point and...
1. What is a paint? Ans. Paints is a viscous, opaque, mechanical dispersion mixture of one or more colouring matter called pigment in a dry oil called vehicle. 2. What are the characteristics of a good paint? Ans. It has high...
1. What is corrosion ? Give examples. Ans. Corrosion is the destruction or deterioration of metals or alloys as a result of chemical or electrochemical reaction with its environment. The well-recognised example of corrosion is...
1. What are electrochemical cells ? Ans. It is an electrochemical device, which converts electrical energy into chemical energy (electrolytic cells) or chemical energy into electrical energy (galvanic cells). 2. Differentiate...
1. Define soft water and hard water. Ans: Soft water : Water which forms lather easily and readily with soap is called soft water. Hard Water : Water which does not produce lather with soap readily but forms an insoluble...
1. What is meant by magnetic materials? Give examples? Magnetic materials are the materials which can be easily magnetized by keeping it in an external magnetic field. Examples : Iron, Ferrites, Carbon steel etc. 2. Define...
1. What are metallic glasses? Metallic glasses are amorphous metals [Glassy metals]. It is a non-crystalline alloys with molten liquid state. It has the short range of atomic order. Metallic glasses share the properties of both...
1. What are Magnetic Materials ? The materials which can be made to behave like a magnet and which are easily magnetized by a magnetic field are called as magnetic materials. 2. How the Magnetism arises in a material? The...
