### Valve Timing Diagram of Petrol Engine

Valve Timing Diagram for a Four Stroke Cycle Petrol Engine - The petrol engines are also known as spark ignition engines. The valve timing diagram for a four stroke cycle petrol engine is shown in Figure below:

The following particulars are important for a four stroke cycle petrol engine regarding valve timing diagram :

(a) The inlet valve opens (IVO) at 10° — 20° before top dead center (TDC) and closes 30° — 40° after bottom dead center (BDC).
(b) The compression of charge starts at 30° — 40° after BDC and ends at 20° — 30° before TDC.
(c) The ignition (IGN) of charge takes place at 20°— 30° before TDC.
(d) The expansion starts at 20° — 30° before TDC and ends at 30° — 50° before BDC.
(e) The exhaust valve opens (EVO) at 30° — 50° before BDC and closes at 10° —15° after TDC.

Notes:

(i) The inlet valve of a four stroke I. C. engine remains open for 230°.
(ii) The charge is compressed when both the valves (i.e. inlet valve and exhaust valve) are closed.
(iii) The charge is ignited with the help of a spark plug.
(iv) The pressure inside the engine cylinder is above the atmospheric pressure during the exhaust stroke.

### Are Engineers Favourite Among Girls?

What do girls think about men who are engineers and what type of engineers are most favourite among girls? A survey was conducted by a team of aboutmech with members chosen from different countries. Each team member carried out a neutral survey in his/ her country to evaluate what females think about most of the engineers from different engineering branches. An overview of different questions asked in survey is given below:

Question: Which male engineers do you find more attractive as a husband?
Almost 50% women voted for mechanical engineers to be the most attractive husbands among other engineers. So mechanical engineers are most favourite among girls as a husband. They find them more trustworthy, intelligent, and creative. A married women from California said, “If your husband is a mechanical engineer, he will help you in everyday tasks. Because mechanical engineers are good team players and they have creative ideas about everything.”

### Best CV Format for Mechanical Engineers

Fifty percent engineers fail to grab a dream job because of basic faults in their CVs/ Resume. This article tells you about best CV format for mechanical engineers and how you are supposed to design your CV when applying for jobs. You CV is your first impression on future employer. He/ she does not know you. Your CV is the only representation of your personality. He/ she may select or reject you after first glance on your resume.
I have experienced shortlisting and interviewing candidates for different jobs. I was astonished to learn that most of the candidates simply copy paste each others CVs without any changes at all. These types of CVs are rejected immediately. I am not trying to tell you that you should avoid copying, rather i ma telling you to refrain from giving your CV to your friends.
An ideal CV consists of following portions:
Name/ Address of the applicantObjectiveEducation RecordEmployment HistoryProfessional SkillsAwards & AchievementsCo-Curricular Activities/ Inter…

### Engineering Mechanics - Introduction

The Engineering Mechanics is that branch of Engineering-science which deals with the principles of mechanics along with their applications to engineering problems. It is sub-divided into the following two main groups:

(a) Statics, and (b) Dynamics

The Statics is that branch of Engineering Mechanics which deals with the forces and their effects, while acting upon the bodies at rest.

The Dynamics is that branch of Engineering Mechanics which deals with the forces and their effects, while acting upon the bodies in motion. It is further sub-divided into the following two branches:

(i) Kinetics, and (ii) Kinematics

The Kinetics is that branch of Dynamics, which deals with the bodies in motion due to the application of forces.

The Kinematics is that branch of Dynamics which deals with the bodies in motion without taking into account the forces which are responsible for the motion.