G.S. SAWHNEY is Professor and Head, Department of Mechanical Engineering at Accurate Institute of Management and Technology, Greater Noida. Earlier, he was Professor and Head of the Department of Mechanical Engineering at GNIT, Greater Noida and LKIE, Ghaziabad. He obtained his B.Tech from IIT Madras (1967) and ME from Pune University. He has over 44 years of teaching and industrial experience. Professor Sawhney has authored more than twenty books including Fundamentals of Mechanical Engineering, Engineering Mechanics, Thermal and Hydraulic Mechanics and Non- Conventional Energy Resources published by PHI Learning, Delhi.