The present book is intended to equip the students and others who are interested in keeping themselves updated in the subject of Agricultural Engineering. There is a vast amount of knowledge already available and is being added everyday. There is a lag between the knowledge available and its understanding by the students. In present book effort is made to provide key points (about 5000) to the students so that they can remember them for various traditional as well as competitive examinations like NET, GATE, IFS etc. The key point presentation can also be useful for preparing visual aid for power point presentations. The present book is expected to fulfill the needs of the undergraduate students in remembering the key points in the field of Agricultural Engineering.