What is a Hydraulic Jack? Before directly jumping on to Hydraulic Jack, let’s first understand ‘Jack’. A jack is a device which is used to lift heavy loads. A jack could be Mechanical, Electrical or Hydraulic, based on the method of force generation. A hydraulic jack works on the basis of Pascal’s law. A small… Read More »
What is a Hydraulic Press? A hydraulic press is a press which uses hydraulic cylinder to generate compressive force. Instead of a mechanical lever a hydraulic equivalent is used in a Hydraulic press. Joseph Bramah from England invented Hydraulic press. Working principle of Hydraulic Press? Before understanding working of Hydraulic press let us first learn… Read More »
What is a Hammer? A hammer is a tool which has a weighted head fixed on a long handle. It is used to deliver an impact on a small area of an object. A hammer head is generally made up of a heat-treated steel (for surface hardness). Handle of a hammer is generally made from… Read More »
What is multi point fuel injection (MPFI) system? Multi point fuel injection (MPFI) is a technique of fuel injection in petrol (or gasoline) engines. Note: Petrol (or gasoline) engines are sometimes also known as spark ignition (SI) engine. In general, a petrol engine uses carburetor to mix air and fuel but it has poor response… Read More »
What is a lead screw? Lead screw is a type of screw which is used as linkage in machines. It converts rotary (or turning) motion into linear motion. Due to large contact area between male and female members of a lead screw, it has very high frictional losses. Advantages of lead screws They are generally… Read More »
What is buoyancy? Buoyancy is the force exerted by a fluid on a body which is wholly or partially immersed in it. How buoyancy force is calculated? Magnitude of buoyancy force is calculated on the basis of Archimedes principal. What is Archimedes principal (or Law)? The magnitude of buoyancy force acting on a body is… Read More »
What is non-renewable energy? Non-renewable energy is a type of energy whose sources can not be replenished in our lifetime (or in many lifetimes). All fossil fuels are non-renewable, but not all non-renewable energy sources are fossil fuels Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the… Read More »
What is Toughness? Toughness is the ability of a material to absorb energy before ultimate failure. Material which can absorb more energy before failure is considered more tough than another material which can absorb less energy. Unit of toughness is Joules per cubic meter. Tests for measuring toughness There are mainly two tests which are… Read More »
What is hardness? Hardness is the property of a material to resist surface indentation (and scratches). Some materials are harder than other materials. For example, metals are harder than plastics, wood etc. Difference between hardness and toughness Hardness is a property which is related to the surface of a material while toughness is a property… Read More »
Laws of thermodynamics Like every other science, thermodynamics is also governed by certain laws. There are basically four laws which are base of thermodynamics. These laws are Zeroth law of thermodynamics First law of thermodynamics Second law of thermodynamics Third law of thermodynamics Now let us discuss each of them one by one. Zeroth law… Read More »