by Maryam Hussain How the working of a theoretical engine was proposed? The theoretical heat engine was proposed by Sadi Carnot in 1824 . Heat engines are devices that can convert heat into mechanical energy. Like a Steam engine or Motor vehicle, the working principle of all heat engines is the same in which any working substance gas or vapor is brought back to the initial stage by going through different thermodynamic stages of a cyclic process . Carnot suggested that, if a heat engine goes through fixed thermodynamic stages of a specified process, then the efficiency of the heat engine may be 100% possible. Ideally, this engine gives maximum efficiency. No other engine can be more efficient than this. The specified cyclic process suggested by Carnot is called the Carnot cycle. The Carnot engine has four main parts: 1). First, an insulated, non-conducting stand , so that the transfer of energy is not possible . 2). Second, a hot reservoir with infi...
by Maryam Hussain What is an airbag? What was its need? Since it is neither viable nor it is desirable to build vehicles as strong as armor fighters, it is definitely required that the basic structures must be designed to collapse in a controlled manner in an accident . In 1951, John Hetrick, an industrial engineering technician, invented airbags. An airbag is a safety device that is usually packed in the center of the steering wheel and in the dashboard in front of the passenger seat. An airbag quickly inflates with air or with some other gas during a head-on collision & cushions a car’s occupants from the impact of the collision. Where is an airbag ergonomic display in driver panel? Whenever the ignition of the car is turned ON to the first step, then, besides other lights within the driver’s panel, the airbag light should glow ON for a short while and then go OUT. If the airbag warning light keeps on glowing, then this indicates a fault within the airba...