Vena Contracta is the point in a fluid stream where kinetic energy is maximum and pressure energy is minimum.At Vena Contracta fluid stream where velocity is maximum and the diameter of stream is minimum.in orificemeter maximum contraction or Vena Contracta takes place at a section slightly down the stream of the flow, at that section…
Geneva Drive is a gear mechanism that translates rotation motion into intermittent rotary motion. The rotating drive wheel has a pin that enters into the slot of driven wheel and make it rotate step by step. The driving wheel has also an elevated half circle that lock the driven wheel in position between steps. The…
Kinematic Pair is the combination of two kinematic links ( a link is a resistant body that constitutes part of the machine ) that have relative motion with respect to each other and relative motion between them is completely or successfully constrained. Examples of Kinematic Pairs are :-i) Rectangular bar in a rectangular hole.ii) Wheel rolling on a…
Cochran Boiler is a modified form of the simple vertical boiler which has various firetubes which can exchange heat to water through convectionThe efficiency of this boiler is much better than the efficiency of simple vertical boiler.In this boiler flue gases will travel in the tubes which will be surrounded by water and water will be heated by…
Vapour absorption refrigeration system (VARS) is mainly used where high power is not easily available.It is different from vapour compression refrigeration system because in this system compressor is replaced with an absorber, pump, and generator.Vapour absorption refrigeration system uses heat energy for refrigeration while the Vapour Compression System uses work energy for refigeration which is…
Rolling mills are classified based on the number and arrangement of the rolls in it. Rolling is a metal forming process in which metal stock is passed through one or more pair of rolls to reduce its thickness and make the thickness uniform. These machines are available in different shapes and sizes and having different…
Sine Bar is a precise angle measuring instrument. It is used to measure angles very accurately or to align the workpiece at a given angle. Sine Bar is the most accurate instrument for measuring angles. Sine bar is made up of high carbon high chromium corrosion resistance steel. Sine bar is made with this material…
Single point cutting tool is used in lathe machine, shaper machine and many different machines.It is used for operations like turning, facing, camfering, boring, shaping etc. Single point cutting tool has only one main cutting edge called Principal cutting edge which arises from the intersection of rake surface and principal flank surface.It is named single…
Polytropic Process can be defined as the process in which heat absorbed by the gas due to unit rise in temperature is constant.A polytropic process is a thermodynamic process that can be expressed using the following equation.PVn=C, It is aPolytropic process equation.Where,P is the pressureV is the volumen is the polytropic indexC is a constant The exponential n can have…
Closed Cycle Gas Turbine is an internal combustion engine that operates on rotary motion instead of reciprocating motion.This turbine works on the principle of the Brayton Cycle. Closed Cycle Gas Turbine is an extended version of Open Cycle Gas Turbine. A cooler is added to the Open Cycle Gas Turbine to make it a Closed Cycle Gas Turbine….