SK ENGINEERS

  WHAT IS FACTOR OF SAFETY ? ·         There are number of parameters, which are difficult to evaluate accurately in design analysis such as, a)       Uncertainty in magnitude of external forces acting on the component. b)      Variations in the properties of material like yield strength or ultimate strength. c)       Variations in the dimensions of component due to imperfect workmanship. ·         In order to ensure the safety against such circumstances factor of safety is used. ·         FACTOR OF SAFETY – is defined as the ‘ratio of maximum stress to working stress’. Mathematically,            Factor of safety (F.O.S) = maximum stress / working or design stress. ·         In case of ductile materials, e.g. mild steel, w...

  WHAT ARE THE STEPS INVOLVED IN DESIGHNING A MACHINE COMPONENT ? Ø   GENERAL PROCEDURE OR STEPS INVOLVED IN DESIGHNING A MACHINE COMPONENT – 1.       Recognition of need – First of all make a complete statement of problem, indicate the need, aim or purpose, for which the machine is to be designed. 2.       Mechanism – Select the possible mechanism or group of mechanism, which will give the desired motion. 3.       Analysis of forces – Find the forces acting on each member of machine. 4.       Material selection – Select most suitable material for each member. 5.       Design of machine elements – Find size of each member by considering forces acting on the member and permissible stress value for the selected material from design data book. 6.       Modification – Modify size of member to agree with past experience and j...

  WHY AIR CONDITIONING IS NECESSARY IN AN AUTOMOBILE? ·         AUTOMOBILE AIR CONDITIONING SYSTEM –                 The air conditioning system is used to keep the occupants inside the car’s cabin comfortable during hot weather. It conditions the temperature of the air inside and also removes the humidity from it which decreases its temperature according to the condition of the air. The system used in modern automobiles is called heating, ventilating and air conditioning system or HVAC. It can cool the cabin during summers, keep it warm during winters and can also removes the humidity from the air inside. The air conditioner for automobile involves, a)       Temperature control b)      Air circulation control c)       Humidity control d)      Air purification control Ø   NECESS...